Hello, I've read alot on theese forums, and I've always seen people having the same problems I have, although, I have checked all the "computer won't boot" threads I could find, no one had the same problem as I have. Speccs: AMD XP 2000+ MSI mobo 1Gb RAM 300W 2 HDD, 80g and 120g 1 CD-reader and one DVD-reader My computer has worked fine without the occational problem for the past 2 years or so, and I 've had a GF4Ti4800SE in it. But I got 256Mb RAM and my brothers old GF6800LE card 2 days ago (he couldn't boot so he ordered a new computer, and the fan was stuck on the gfx-ard so I put my GF4 fan on it), and it has worked like normal for the past few days. This morning, however, I turned the computer on, and I got the usual "CPU fan isn't running" error msg in the loadup screen before it checked for IDE stuff (which is because I put a thing I can reglate the RPM on my 120mm CPU fan, and when I put it on 1300RPM instead of the usual 2000RPM the computer thinks it isn't working, although I've checked several times and it IS running). So I hit the reset button infront of the computer, and I got the same message again, still, nothing out of the ordinary, since the computer works fine. So I hit the reset button again, and nothing came up. Just a black screen, but the computer goes on like nothing's wrong. Funny part is, this happened to my brother last week, and that's why he bought new mobo, gfx-card and RAM. He suspected it was his mobo that for some reason siezed to work. It has to somehow be connected to the gfx-card or the RAM module since suddenly my comp stopped working. I've tested my screen (19" TFT 8ms), and it works perfectly normal. I tested with my old GF4 card, and nothing showed up. I tested with my old GF5500 and same problem. I even tested with my super-old GF2 and still the same problem. I've reseted CMOS, and same problem. I even took the entire computer apart, cleaned everything (nothing was really dirty), and put it back. Same problem. I disconnected the 2nd HDD, and the CD-reader, same problem. I removed the DCD-reader as well, didn't work. I tried booting with only my 2nd HDD as master (no cd/dvd-readers plugged in), and nothing. I'm at the verge of my expertice, and I have no idea what to do to fix it. *The mobo is, and has always been, on the plug thingys preventing it to touch the case. *It has worked perfectly well last 2 years, after every upgrade, and even 2 days functioning perfectly normal after last update. *It worked 2 reboots and suddenly it just refused to boot again. *There is as far as I've seen, any compatibility issues regarding the hardware. *I'm totally lost. If you want more accurate speccs I can hant it to you, but with my limited knowlede, I didn't think it was neccessary for it. Also, I haven't installed any new software, not counting my latest purchase Civilization 4, for the past week(s). /Regards Raphaei PS. I'm writing this on my laptop which I'm not used to type on, so if there is any misspellings, it's because I'm not used to the keyboard.