I am upgrading a friend’s PC from XP Home to Vista Home Premium. After an ordeal of trying and failing to log into the computer running XP on non genuine software (keep in mind that this is an originally rebuilt computer that has had 3 different owners in the past 4 years), I was able to somehow log in after rebooting with a “Get Genuine” CD. After running windows update and rebooting, the computer was up and running for about 30(?) hours. The next day, upon noticing that the computer had shut down(on its own), I tried the power button only to see the blue light cathode tube installed in the case flash for a half a second- no other sounds or activity except for the red LED motherboard light lit up and remained lit. After doing some research, I surmised that it was a bad power supply. I replaced a 350W power supply with a Dynex 400W power supply and success! The system booted up and logged me in without a problem and ran fine for the day. I shut it down and let it rest up for all the work and upgrades I would be performing on it the next day. The next day I installed 512MB of RAM to go with the original 512MB already installed. Booted up- no problem. System recognized and properties displayed the correct new 1GB of RAM. A couple hours later, I shut the computer down and installed a PNY Nvidia GeForce FX5200 video card. Booted the system and it performed fine, recognizing the new video card however the hardware wizard never initialized and the system never prompted me for drivers for the new card(which was replacing an older Nvidia card). I then decided to just force feed the system the drivers using the video card install disk. After inserting the installation CD, the autorun would not initialize and double clicking the CD drive would not allow me to run the “.EXE” file on the CD. I attempted the same feat in the CD-RW drive only to have the same result. I then decided to go into “Device Manager” to be sure the video card was working properly. While in “Device Manager” however, I noticed that under “Other Devices” there was a “RAID controller” with a warning sign. I double clicked on it and in an attempt to correct any issues it might be having clicked on the “Reinstall Drivers” button. Upon clicking on it, the system immediately went dead and reverted to the same state it was before installing the new power supply- no boot process, no display, no sound or activity except for the quick flash from the cathode light in the case and the small red LED on the motherboard. I am now right back at square one and very frustrated. I swapped out the new power supply to another PC and it worked fine, so I’m not thinking it’s another power supply issue. Just looking for some advice or answers at this point! Really hoping to avoid scrapping the whole upgrade process, especially after purchasing all the necessary hardware, but other than installing a new hard drive or motherboard, I’m not sure what else to do.