HP Pavillion m733n. Put new graphics card with HDMI port, 1Tb HDD, and dual tv tuner card. Pressing F1 while pressing Power ON causes "entering setup..." to appear but freezes at that point. Took all the cards out and put the original HDD back and it still does the same.
I reset the CMOS jumper and took the battery out as another attempt, but same result every time.
Any other suggestions?