I am trying to repurpose an old Precision T1500 tower. It has an i5-760 CPU and H57 chipset. I had a graphics card in the x16 PICE-E slot and everything worked well. I removed the card and expected the integrated DVI to work but it does not. I know the monitor and cables work so the problem must be related to the integrated dvi port. When I try to boot using the port, I hear 5 or 6 beeps and the system does not boot. Any suggestions on what might be the problem would be greatly appreciated.

The mother board DVI port is DVI-I (dual link), monitor and cable are DVI-D (dual link)