I scaled thru d problem of fixing my powepack at last and when we put it back it came on but later didn't boot up.I have a 12gb corsair ram in it and d memory ok light stays on on my asus board.how can I solve this problem.

One way to solve it is to be more clear.

power pack you mean power supply?
it could be anything - RAM, processor, MB, could be even power supply, I've seen that, or just dead video card,
what's the beep code?
start eliminate problem starting from simple like video card and RAM to more complicated like proc and MB