So I got a video card for my card-less system, and I powered up and...right back down. It turns out the card needs at least 300w power supply, and after checking the specs on mine, I only have 250. I've found a nice cheap upgrade at Newegg (it's right here if you can offer any opinions), but I've never installed a power supply before. Is it difficult?
I've put in new RAM, a hard drive, a CD burner, and a video card before, so you can gauge my expertise based on that.