Pc wont boot with keyboard plugged in

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hmmnn....got a compaq deskpro 733...over the last month the mouse has been goin crazy on me, but now the pc wont boot with the keyboard plugged in (just hangs with the moniter not turning on)but if i unplugg the keyboard the moniter turns on and gives me the keyboard not plugged in error.....
ive stripped the machine down with no cards or drives in and still get the same problems, reset cmos and replaced the chip....but still no different results...is this a motherrboard packin in or what!!!

if anyone could help i would be grateful......
 
This might sound silly, but this happens sometimes when you plug the keyboard into the mouse port.

Also, I've seen plenty of bad keyboards keep systems from booting.
 
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