New Hard drive messes up my video

[PhoneMatt]

I have a Dell Inspiron desktop, and I have just installed a 2T hard drive. (Seagate Baracuda). After the install, my desktop shows ghosts- sort of like the old multipath distortion on analog TV's. The machine has an NVidia Geforce 310 video card. I am currently using the VGA input for my monitor and the HDMI going to my TV. The HDMI output is fine, no ghosts. The VGA sucks. (It has a dvi output, which I haven't tried yet.)
Of course the question is, what the hell went wrong? I have a feeling that the power supply isn't strong enough for the hard drive and the video card, but that is just a gut feeling. (That and the fact that Dell will use the smallest and cheapest power supply that they can get away with.)
Does anyone have any thought about narrowing down the source of the problem?
Thanks.

Matt

OK, just tried the dvi input- works fine. And before anyone asks, yes I did try a different cable and all of the connections are tight. So it looks like just the VGA is messed. Now, I'm really confused.

[turk690]

If you take out the Baracuda, will the VGA distortion go away? Do you have another VGA card? Is your PC PSU at least genuinely 500W?
VGA is analogue and can be prone to this problem. But the last time I had a similar case was when I had attached a VGA monitor about 10meters away from a PC and used 15meter VGA cables. I traced the problem to the cheap VGA cable that had no shielding and didn't even have any genuine 75Ω cables inside; it was just straight wires.

[Nelson37]

Re-seat the card.

If you want to test the power issue, disconnect the new drive. Or is this a replacement for an original drive? Very low power draw, and small differential amongst drives. Unlikely this is a power issue.

Most likely the card was bumped during the drive install. Remove and re-insert.