is it making any noise? if it is, you can find what each noise pattern means online somewhere, i personalyl dont know cuz theres alot of them. and i think it includes CPU LED blinking... it could be something with the RAM.... last time that happened the ram wasnt all the way in... but i will assume that its all the way in.
and what is your computer? i believe that there are different error code patterns for each brand...
if you bought it premade by toshiba or HP, you can find it, but right now im having trouble finding a universal pedigree thingy majig if you custom built it... which you probably did. ill update once i find it.