I ordered a card reader for my system (System #1 in my specs). So I shut down and pulled the power cord from the PSU (after shutting down), then to get any extra juice out of it I pushed the power button. Then I took the side and front panel off and put in the card reader and hooked it up to the mobo. During this, I noticed the system was moderately dusty, so I blew it out with canned air, in place, figured I'd just vacuum the area up later. Put the front panel back on and hit the power button, everything fires up, but I don't get anything on screen. I also do not get any beeps. The fans all power up and stay on, the hard drive spins up, vid card spins up, everything *seems* normal, I just don't get a POST. It also doesn't sound (or look based on the hdd activity light) like Windows is loading up at any time. Here is what I've done to try and fix it so far: Removed video card to access CMOS jumper, reset with that. Even pulled the battery and hit the power button (while unplugged from the wall) for good measure. Disconnected all unnecessary hard drives. Disconnected the USB header for the card reader. Unplugged the PSU, flipped the voltage switch on back, then flipped it back to normal. Switched to a spare PSU. I'm a bit unsure on what else to do. I didn't touch anything else in the system during the addition of a card reader. I'm going to remove the RAM and put it back in just because that is simple enough to do. I really don't want to unmount the CPU and reseat it because I didn't do anything with that, and my heatsink basically requires I remove the entire motherboard to reseat - guess this is where a super expensive case is nicer Edit 1: Removed RAM, Powered up. Got warning beeps. Put 2GB back in. No POST.