Stubborn

I'm an idiot. I just bought a new PSU to go with my new geforce 7800gt and my Fatal1ty sound card. My old video card is integrated into my motherboard (it's an HP media PC) and it totally slipped my mind to uninstall the old integrated card from my control panel. So I fired the thing up with the new video and sound card, with the DVI cable connected to the new video card, and my monitor displayed a "No signal" message and does a power save shutdown.

So I figured this would be no big deal and all I needed to do is take the new video card out and fire it up with the analog cable running off my inntegrated card. This didn't work. I tried taking the RAM out and putting everything back in that came stock with the PC. Still it doesn't work. The power comes on, the processor fan and vent fan come on, but it doesn't make those noises that it's supposed to when it communicates with the hard drive and of course there's the no signal message so I can't do crap with it.

I talked to HP tech support and he basically told me I needed to send it in. Any suggestions?