This is my pc's description: model: acer aspire M5100 ( M5100 - AM5100-U5300A ) S/N: PTS870X05274802C532702 SNID: 74801134727 AMD athlon(tm) 64x2 dual core processor 4400+ 2.30GHz I added a thermaltake TR2-550W power supply and running a GeForce9600Gt graphics card the pc came with 2 gigs ram. I tried adding another 2 gigs but screen came up black during restart. After doing reasearch and running a performance test on crucial.com I found out I could put up to 8 gigs ram but I had to match up the cards, so I went out and bought 4x 2gig ram cards,... Screen went black... I reinstalled windows 64 bit, everything was ok, booted up and ran fine. Till I installed the latest version of the geforce software. When It rebooted after installation the screen went black again. I've been getting the runaround for months now,.. Some say my processor can't handle it when all the tests I perform tells me I can run 8 gigs. Another person told me my power supply wasn't capable of supporting the 8 gigs ( that's when I installed the newer 550w one. Some say it has to do with my graphics card when others say it has nothing to do with that... Now I'm stuck with 6 unused ram cards and a pc that only runs max at 3 gigs. I tried removing card by card, at 4 gigs I get a picture but sound is really static, at 3 gigs my pc runs perfect.. But anything more then 3 gigs and something doesn't work,... Pls help motherboard serial# is M/B MBS870900174702A67EK02 thanks for you time!!