I just installed a tv tuner video capture card and at first all was ell. got tv on the box! But then out of no where the system reboot itself. Then I turned to tv tuner back on and no picture but sound. I am wondering if my power supply is not handleing the add ons. I have no Idea what PSU is in it now but intend to find out. I have added a sound card, Graphics card with its own fan, 2 case fans. now the tv tuner. Its P4 system. The tv tuner is a Phillips I got off of Ebay.