USB Ports Quit Working / Monitor Wont Turn On

I recently put together a new system. My general specs were:

ASUS P5Q Pro
GTX 295
Intel Q9550
4GB of DDR2
Vista

I got everything running for about a week or so. Everything ran smooth, no problems I could find. I ordered another fan to install on the side of my case and it arrived yesterday. I unplugged everything and installed it. When I plugged everything back in to start it up, the following things did not turn on. The keyboard, the mouse, the USB drive on the front of my computer, and the light on the monitor was just blinking.

So from what I could tell, none of the USB ports were working since nothing was turning on (All of those items go through USB). I have a razor copperhead and the lycosa keyboard. I have a 21' Samsung and after connecting it firmly, all it had was the blinking blue light. It clearly was getting power but no signal from the computer? Everything else started up fine it seemed from looking at the overall computer. The green light on the motherboard was on during this.

I didn't really do anything extensive during the time I had the case open. I basically worked on the side panel and only when into the case when I needed to connect its power. Would anyone have any idea what may be the problem? If anymore information can be provided, please let me know so I can fill you in.

 

you may have dislodged a connection. Unplug/reconnect both mother board power cords, reseat your graphics card, make sure its power is plugged in. If problem persists check your hdd connections and reseat your ram.

 

I went in yesterday to check everything once again. I took most of the connections out and reseated them as I went. I also reseated my video card and the RAM. Like I said, it seems like power is getting to everything (Even the MOBO). I thought it might be the MOBO going out since it was both the USB ports (front and back) and the video going to the monitor. Any other thoughts on what I might be able to do to test this?

 

Can you test a different video card in this system or test your current card in another computer?

 

stupid question. did you ever unplug the fan you just bought? also, you might want to slowly unplug (of course with power off) items (dvd/cd player, etc), to see if you can isolate the problem? - g/l, sos