Okay so I had some leftover junk from upgrading my 2 rigs (in specs) and decided to put together a third! Mobo: Asus Nodusm3 - Came with the HP system. CPU: Athlon X2 4600+ - Upgraded to Athlon II, planned on selling it but decided to put together a rig from spare junk I had laying around. RAM: 2X1GB Kingston 533/2X1GB Siemens 533 - Siemens came with the HP system, Kingston I bought. HDD: Barracuda 7200.9 250GB - Came with the HP system. PSU: Apevia 500W - Paid $20 for it off the Egg, used it for a month or so, it has been laying around for half a year (or more). GPU: 8400GT - Paid $13.50 for it on eBay. It's nothing special, I just plan on using it as a backup rig for the lengthy periods of time where I'm in the process of an upgrade and need a computer to use. The old P4 that used to serve this purpose has been given away... so yeah why not right? For some reason, everytime I hit power I hear the fans, HDD, PSU, and DVD-RW all run but the computer just beeps for 1 second every 1-2 seconds. <- Just an approximate guess... What exactly am I doing wrong? I did install Vista on the HDD (before replacing it with the Caviar Blue in my specs) but that's no reason for it to not even get to the BIOS.. I plan on using the recovery discs I ordered from HP to install XP Media Center on it. (I'm using the same motherboard, HDD, and RAM that came with the system b4 I ripped it apart so it shouldn't be an issue.) The mouse and keyboard don't seem like they're getting any power either, the thing just beeps. I took out the CMOS battery for a few minutes but that doesn't seem like it did anything. I'm also not using the Kingston RAM or 8400GT until I get XP installed again so it doesn't interfere with the recovery disc recognizing the system as a valid HP system.