i recently converted my old AMD Athlon 64 X2 machine running on an Asus M2V-MX SE to HTPC. The OS I'm running is Linux Mint. I tried to drop in a usb 3.0 card into the PCI-e slot because my external hd with all my media is a usb 3.0 drive and i'd like to take advantage of the extra speed when copying large media files. After I did that, the computer wouldn't boot. Fans would go on, but the screen stays blank and it wouldn't post. So I don't think that it's an issue with a Linux incompatibility, since it wouldn't post. I just got a blank screen. My psu should be sufficient, it's a rosewill 400w psu, snd I don't have a lot of peripherals. Is this just a bad card, or is for some reason, do USB 3.0 cards not play nicely with really old motherboards?