Ok, I hope I have abided all the rules and regulations here.
Thanks in advance for all your help.
Right where to start? I guess I will start right from the beginning.
So I bought my computer in may 09 off ebay, everything was perfect up until about september 2010 when I rearranged my room including my computer desktop and made it so the computer couldn't flow air efficiently forgettting that I had to let my computer breathe, with it extracting alot of hot air it wasn't long until the power supply blew, after that it wouldn't power on or anything, it was dead. Then a couple weeks later my dad got me a new power supply and he installed it for me and the computer worked again and I was on my desktop, but I kept getting blue screens but considering I was happy enough to have my computer working again I thought i'd rather have my computer restart every now and then than have nothing at all, despite my dad telling me I shouldn't continue using it as it may get worse. And so a couple months later one day I went to power on my computer and nothing happened, for many many months on nothing still happened, so my dad suggested I buy a new motherboard, so I did and he installed it for me and we got new ram and everything was fine again, except I lost all my files, pictures, music the lot. So I've been using my computer for 3 months now and it's been perfect up until Friday night. For the past 2 months my computer has had more usage out of it than ever before, I leave my computer on 27/4 even when i'm not there and it's always functioning to it's maximum limit or at least 75% of it, as I am running multiple instances of a java based game. So it's been fine since I started putting it in heavy usage 24/7 for 2 months but now it's started to act up, on friday night my computer closed all the programs and explorer.exe crashed and the only thing I could do was switch between programs, I couldn't ctrl-alt-del or open start, then I restarted the comp and I got a blue screen, so I booted in safe mode and it was ok but I couldn't open anything so I just did a system restore, I booted in normal again and got blue screen, then safe mode and then normal again and it was fine, by the way the blue screens both said MEMORY_MANAGEMENT which started to panic me because I just bought the new ram a month ago for Â£45, I did a memory diagnostic test and it said I had defective hardware, most likely the ram unfortunately. So just last night I thought i'll continue as normal just to see if the problem is still here and I set up the multiple java based games left it on over night and it had shut them all off by 1am. I restarted my comp this morning as I had the same problem as I did the first time and set up the games again and after about 10 min they all shut off and once again so did explorer.exe so I did a virus scan as I was really concerned about my computers behaviour,because after it would shut down the java games, Google chrome, IE, the desktop, side bar and avg closed aswell. but the scan didn't help, so now i'm out of ideas and hope I can seek help from you guys.
My pc specs are:
CPU: AMD Phenon 9650 Quad-Core Processor, 2300 Mhz 4 Cores 4 Logical Processors
Motherboard: Asrock N68C-S UCC
RAM: 4GB RAM 2x2GB DDR2
Notes: I'm currently using the computer and have not had any problems as of yet but i'm going to try running the games again and see how it runs, If the problem is within running using too much RAM/CPU then i'm totally confused, good luck guys!