Problems with the CPU can also cause the keyboard to not be used

Symptom: A friend's old computer, configured as: Celeron 800 processor, 512MB RAM, ASUS VIA694 Motherboard. Recently the keyboard does not work properly, the initial judgment on the motherboard of the keyboard interface is broken, let me help find a piece of old motherboard change. I have a spare board on hand, let friends bring the computer over.

Fault handling: The author will be the main board to replace, and then the power to boot. Strange thing happened: need to press the power switch several times to light, unplug the power. Try to discharge the BIOS and reseat the individual board parts. Fully installed, the boot again, heard the "drip", press the Del button, but can not enter the BIOS. It seems that the problem is complex, the author's keyboard is absolutely good, and the motherboard for a long time useless, is the motherboard also broken?

Keyboard connectors for two consecutive motherboards are less likely to be damaged, and the problem is definitely in other hardware. Can show normal, said obvious card problem is not big, it seems to change the CPU first to see it. Find block old Pentium ⅲ800 switch on, set the processor FSB and frequency multiplier, boot all normal, the keyboard can be used normally. The old Pentium ⅲ800 switched to a friend's Asus VIA694 Motherboard, the keyboard can also be used normally.

Failure Analysis: The keyboard can not be used unexpectedly is the CPU is bad, this kind of does not make sense. Friends to get the repaired computer, chatting up, this just learned that the CPU has been overclocking use for 3 years, it seems that the root found.

Learn a trick: overclocking there is a risk, we do not recommend long-term excessive overclocking.