stupid question?

[moonsocket]

im sure ive seen something on this before but now i cant find it. when i turn on my computer all the drives spin up etc but it doesnt boot. no post screen or anything. so i turn off the power switch and it comes on perfectly...this happenes everytime i shut it down. this is the second computer with an abit kt7 raid ive had that does this...different boards and components......has anyone had this problem?