Common faults and solutions for industrial computers: 21 items:
1. Power on the computer but it does not respond:
1. Check if the power outlet has electricity and is properly connected to the computer;
2. Check if the computer power supply is functioning normally (check if the power supply fan spins after powering on) and if the monitor is properly connected to the main unit;
3. Open the case to check if the power supply is properly connected to the motherboard, if the connections between the motherboard and the base are loose, if the motherboard is powered on, and if the ATX power connections are correct;
4. Remove the memory stick and power on to see if it beeps;
5. Replace the CPU or motherboard.
2. After powering on, the power indicator on the motherboard lights up briefly and goes out, unable to power on? First, check for any foreign objects inside the case, such as screws, which could cause a short circuit. Secondly, check if the power cable is connected incorrectly, leading to a ground short circuit. Finally, use a substitution method to replace the power supply, motherboard, or base.
3. After powering the industrial computer, the power is working normally, but the motherboard does not respond? First, remove any peripheral cards and connected devices to see if it can start. If not, remove the memory to see if it beeps. Then check if the CPU is functioning normally. Finally, replace the motherboard to check its functionality.
4. After powering on, you hear the motherboard self-test sound but there is no display on the monitor:
1. Check if the monitor is properly connected to the main unit;
2. Insert another graphics card to see if it displays normally;
3. Clear the CMOS (there may be an error in settings) or replace the BIOS;
4. Replace the CPU board (integrated graphics card) or monitor.
5. After powering on, there is a beep but no display on the monitor:
1. Open the case to check if the memory stick is installed or loose;
2. Remove the memory stick and check if the beeping sound remains the same;
3. Clear the COMS (there may be an error in settings) or replace the BIOS;
4. Replace the graphics card or insert an external graphics card (integrated graphics card on the motherboard).
5. A long beep generally indicates a memory fault; continuous short beeps can indicate either a graphics card or BIOS error; if you can enter the system but hear intermittent short beeps, the motherboard BIOS has a CPU temperature alarm setting that will beep intermittently when the CPU temperature reaches the set limit.
6. Analyzing the beep sounds after powering on:
Award BIOS
1 beep — System is starting normally
2 beeps — General error
1 long 1 short — RAM or motherboard error
1 long 2 short — Monitor or graphics card error
1 long 3 short — Keyboard controller error
1 long 9 short — Motherboard Flash RAM or EPROM error, i.e., BIOS damage
Continuous long beep — Memory stick not properly inserted or damaged
Repeated short beeps — Power supply failure
AMI BIOS
1 beep — Memory refresh failed
2 beeps — Memory ECC check error
3 beeps — Basic system memory, i.e., the first 64KB, check failed
4 beeps — System clock error
5 beeps — CPU error
6 beeps — Keyboard controller error
7 beeps — System real mode error, cannot switch to protected mode
8 beeps — Display memory error
9 beeps — ROM BIOS check error
1 long 3 short — Memory check error
1 long 8 short — Monitor or graphics card error
Phoenix BIOS 1 beep: System starts normally
1 short 1 short 1 short: System self-check initialization failed
1 short 1 short 2 short: Motherboard error
1 short 1 short 3 short: CMOS or battery error
1 short 1 short 4 short: ROM BIOS verification failed
1 short 2 short 1 short: System clock error
1 short 2 short 2 short: DMA initialization failed
1 short 2 short 3 short: DMA page register error
1 short 3 short 1 short: RAM refresh error
1 short 3 short 2 short: Basic memory error
1 short 4 short 1 short: Basic memory address line error
1 short 4 short 2 short: Basic memory check error
1 short 4 short 3 short: EISA sequencer error
1 short 4 short 4 short: EISA NMI port error
2 short 1 short 2 short to 2 short 4 short 4 short (i.e., all combinations starting with 2 short beeps): Basic memory error
3 short 1 short 1 short: From DMA register error
3 short 1 short 2 short: Main DMA register error
3 short 1 short 3 short: Main interrupt handling register error
3 short 1 short 4 short: From interrupt handling register error
3 short 2 short 4 short: Keyboard controller error
3 short 3 short 4 short: Display card memory error
3 short 4 short 2 short: Display error
3 short 4 short 3 short: Display ROM not found
4 short 2 short 1 short: Clock error
4 short 2 short 2 short: Shutdown error
4 short 2 short 3 short: A20 gate error
4 short 2 short 4 short: Protected mode interrupt error
4 short 3 short 1 short: Memory error
4 short 3 short 3 short: Clock 2 error
4 short 3 short 4 short: Real-time clock error
4 short 4 short 1 short: Serial port error
4 short 4 short 2 short: Parallel port error
4 short 4 short 3 short: Numeric co-processor error
Compatible BIOS:
1 short: System normal
2 short: System power-on self-test (POST) failed
1 long: Power error, if no display, then it is a display card error
1 long 1 short: Motherboard error
1 long 2 short: Graphics card error
1 short 1 short 1 short: Power error
3 long 1 short: Keyboard error
6. After powering on, the motherboard cannot pass the self-test:
1. Press “Del” to reset the CMOS or clear the CMOS;
2. Replace the memory stick;
3. Refresh the BIOS or replace with the same BIOS chip.
7. After powering on, the motherboard works normally, but the BIOS detects a keyboard issue? First, check if the keyboard lock is engaged, and unlock it.
8. After powering on, other parts work normally, but the floppy drive read light stays on and the floppy drive cannot be used? It is likely that the floppy drive data cable is connected incorrectly.
9. The industrial computer could boot before installing the hard drive, but now it cannot start after installation? Please first check if the hard drive data cable is connected incorrectly.
10. Both the mouse and keyboard are unresponsive? Check if there is a keyboard-mouse splitter; if so, swap the keyboard and mouse connections.
11. After powering on, the motherboard passes self-test but cannot boot from the hard drive:
1. Press “Del” to enter CMOS to check if the hard disk parameters and boot order are correct;
2. Boot from the optical drive or floppy drive and check if the hard drive has a bootable system or if the hard drive is properly partitioned and the boot partition is activated;
3. Use FDISK/MBR command.
12. After powering on, the memory self-test does not match the actual capacity:
1. Check if the motherboard video memory (integrated graphics card) shares memory with the motherboard, which would take a portion of memory as video memory;
2. Check if the memory is small chip memory (i.e., each chip capacity is less than 16M, for example, 128M memory should have 8 chips), as some older chips do not support large chip memory, and if inserted, it will only show half the capacity;
3. A very small number of motherboards use special CPUs that occupy part of the memory as instruction decoders for CPU instruction set conversion, thus causing a mismatch in memory capacity.
13. After powering on, the system cannot fully enter and freezes or shows a blue screen:
1. Check if there are resource conflicts;
2. Check if there are errors in the BIOS settings;
3. Replace the memory stick;
4. Re-partition, format the hard drive, and install the operating system.
14. The industrial computer tests normally at the company, but when the customer powers on, it just enters the system and there is no display, and the monitor signal light keeps flashing?
Generally, this is due to the resolution or refresh rate being set too high, causing the customer’s monitor not to display. Enter safe mode to reset the settings.
15. Cannot find PS/2 mouse after entering the system:
1. Check if a 1-to-2 adapter is used and connected correctly; sometimes you need to swap the keyboard and mouse plugs;
2. Press “Del” to enter CMOS and check if the PS/2 option is enabled;
3. Check if the IRQ used by the PS/2 mouse is occupied (generally, the BIOS assigns IRQ 12 to the PS/2 mouse);
4. Check if the mouse driver is loaded (mainly for NT operating systems; if the mouse driver is not loaded during system installation, the mouse cannot be driven afterward);
5. Replace with another mouse.
16. Windows system freezes or shows a blue screen during operation:
1. Check if new devices installed are causing resource conflicts;
2. Check if incorrect or outdated drivers are installed;
3. Check if the system is infected with a virus;
4. Check if the CPU fan is still functioning normally;
5. Check if system files or applications and disks are damaged;
6. Check if there is memory incompatibility or memory issues.
17. Unable to install device drivers correctly:
1. Check if the driver is the latest and supports the operating system;
2. Check if the driver requires support from patches for the operating system;
3. Check if resources occupied by other devices conflict with those needed by the device requiring drivers;
4. If it is a peripheral device, try a different slot and reinstall the driver;
5. Replace the device and reinstall the driver.
18. ATX power supply cannot completely shut down:
1. Check if the ACPI option is enabled in the BIOS;
2. Check if the ACPI option was enabled during system installation or if the system supports advanced power management;
3. Some motherboards must connect the ATX wiring to the GND pin (such as PEAK-639VL2).
19. Industrial computer startup time is excessively long (ESP WIN98):
1. Disable auto-start items in the system startup files;
2. Run SCANDISK for a comprehensive disk check—check for bad sectors;
3. Run disk defragmentation program—eliminate fragments;
4. Run disk cleanup program—remove junk files;
5. It may be related to the network card installation: adjust network settings;
6. It may be infected with a virus: kill it.
20. Due to improper software installation, *.vxd files are missing, severely preventing system entry:
1. Take note of the missing files and paths during startup;
2. Boot the computer with the WIN98 startup disk;
3. Type EXT, press enter at the prompt: PLEASE ENTER THE PATH TO THE WINDOWS CABFILE, then enter the full path of the WON98 compressed package, and press enter;
4. Follow the subsequent steps as prompted by the computer to enter the noted file names.
21. Local printer cannot print over the network:
1. Check if the network cable and network configuration are correct and if it can connect to the network normally;
2. Check if the printer in the computer’s print settings matches the shared printer;
3. Check if the printer is functioning normally;
Can USB hard drives and flash drives be used as boot disks? This depends on whether the motherboard BIOS supports it; for example, W130, STX88601, etc., can, while older motherboards generally do not support.
(Source: Internet)
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