Out of the blue I can no longer boot. Sytem turns on and the light flash on keyboard...nothing else. I have cleard cmos, unlugged, etc....I am lost. Does the keyboard mean somehting/?
Well.. I am guessing on this one... but I would assume that your system is getting some way throught the POST (power-on self test) and then barfing at some point, hanging the system.
reseat the following (pull it out and then put it back in):
1) memory
2) video card
...pull any extra PCI cards (until you can get the system to boot) and check to make sure the power and IDE cables are properly seated on the mainboard and drives.
That will getcha started!
Phase two is swaping parts out of your machine to test in a working system. Hope it doesn't have to go that far.