Hi! Last week ups all of a sudden died which forced me to plug my PC right into the wall, yesterday there weas a powercut after which upon restart it would only read 6 out of 8gb ram. I took out all the ram and put it back in and it worked fine. Then today there was another powercut, and now all it does is beeping, i got it to start up twice reading only 2gb ram and it would collapse after not even fully booting up. I tried every ram configuration of the four 2gb sticks (two factory shipped and two CNmemory I added over a year ago) how can i rule out what the problem is?