Today I encountered a Lenovo computer from 2009 that only makes the sound of the CPU fan running at high speed on boot, but the monitor has no signal, and the mouse and keyboard lights are not on. Repeatedly switching it on and off has no effect.
First, determine if there is a POST (Power-On Self-Test) failure.
Solution Approach: First, eliminate the possibility of a faulty data cable.
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Booting with the CPU fan running at high speed eliminates the power supply issue;
2. Clean the memory stick and treat it for oxidation;
3. Remove the memory stick and check if there is a beep sound when booting; if there is, it indicates that the POST can proceed normally;
4. If there is no beep sound when the memory stick is removed, it indicates a motherboard failure;
5. Replace the battery on the motherboard; if there is a beep sound when booting, turn off the machine, install the memory stick again, and boot up. The CPU fan will work normally, and the monitor will have a signal output, allowing the system to start normally.
6. If a memory stick failure is determined, replace the memory stick for testing; generally, this troubleshooting will help find the cause, and if the memory is normal, the last suspect is the motherboard.
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