First off, my specs: WIndows XP Pro (SP3) ASUS M2N32-SLI Deluxe (Wireless Edition) 2GB DDR2 800 (PC6400) - OCZ OCZ2N800SR2GK (More on this later) PNY 8800 GTS 640 MB (OC to 660/1010) AMD 64 X2 6000+ 3.0GHz (OC to 3.21) CORSAIR 620 Some lame 80GB IDE along with a plain DVD drive (IDE) Here's the situation. I've been playing on this thing for over a year already with no problems after the initial setup. Just recently I got a hold of Age of Conan and thought maybe it was time to step up on my RAM since the game requires 2GB and I wanted to go a bit over to ensure smooth gameplay. So what I did was I went back to newegg.com where I bought the PC in the first place and placed a second order for the exact same RAM which is the 2GB of OCZ stuff which was about $28 after rebates, I couldn't say no. It comes in today and I put it in, only to find that it doesn't work. I can't boot up with all four in. No post, just black screen. I've had a successful boot with 3 sticks, but that quickly ended as soon as the Windows login screen came up. I've tried the two new sticks alone and they allow boot up - I've tried putting them in all of the four slots to make sure none of my slots are bad, and all slots seem to be fine. The thing that's really puzzling me here is that all four of these sticks should be identical. They look the same, share the same model name, and even have the same timings, so why on earth won't they boot up together? In another test, I tried using one old stick, one new stick, in dual channel. It worked for a while, long enough for me to install SP3 to see if that'd do the trick, but upon reboot after the SP3 installation, I got a post, went to Windows login and immediately bluescreened to a restart. Can't get it to work. As of now I'm just using my two old sticks and I'm thinking it could be that the RAM is bad. Am I missing something here or should I just RMA the junk? P.S. - I do realize that using 4GB in XP 32-bit means I'll miss out on a bit of RAM, but at $28 for these new sticks, I don't mind sitting on 3.2GB. Thanks in advance! Going to take a nap. I'll check up when I'm back.