I recently bought an ATI HD 3650 video adapter to install on my older computer, a Compaq Presario SR1230NX with a ASUS A7V8X-LA motherboard. I uninstalled the onboard video driver and installed the 3650. But, when I started the computer, all I got was a constant beeping, e.g. beep, beep, beep... The OS doesn't boot, nor do I even see a BIOS or anything on the monitor, just black screen. Any ideas ? I have pulled the card out a few times to ensure that it was seated properly, and I also upgraded the PSU to 430 w. The computer booted up fine before the video card was installed.