Hello, The computer I am trying to boot is running Windows XP. I can't access it much to tell you many details, but I will try to provide what I can. The computer is a Compaq Presario SR1603WM. Integrated Graphics is ATI Radeon Xpress 200, which I upgraded with a PNY GeForce 6200. My RAM is 3x 256 MB sticks. My problem is that I opened the case for a routine cleaning to rid it of the dust. When I did, I decided to clean the heatsink extra, so I popped out the prongs and lifted it up to clean it thoroughly. I noticed a chip with a lot of little golden needles sticking out of it, to go into the sockets below. I was careful not to mess with those. I put it back in, put my computer back together, and when I tried to boot I got the black screen with the fan running at 100%. I thought I didn't put the heatsink back right, and i'm still not sure if I did. I've made sure it fits in correctly or pretty close, but I think this might be the problem. I've taken the battery out, cleaned my RAM sticks, inserted them one at a time, tried it without the PCI graphics card, everything. I did finally get it to beep on startup like it normally does, but still no screen and the fan is still at 100%. If I hold down the power button for a few seconds, the fan will shut off but the computer remains on. If I press it again, the fan starts at 100%. After the first time, after holding the power button again, the fan stops for half a second and resumes. Any idea what is causing this? I want my computer back. Its not good, but I like it! Help!