if you get the colors immediatly after turning on you computer its a hardware issue, most likely the vid card since u tried other monitors.
ive had similar issues when the vid card is fried. did u get it new or used? from a reputable site or joe blow? if its never worked, its probably the vid card. some vid cards require additional power, via the same plug that a floppy drive uses, directly to the vid card, see if it has one, if its plugged in or not. has the heatsink been removed and reinstalled on the vid card? if done improperly it wont be as effective, causing the chip to overheat and burn out.
try reseating the vid card, or if you have onboard video, remove the card, disable the onboard in the bois, shutdown, install card and then power up.
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