Hi,
I am wanting to repurpose an Asus built NVDIA GTX 750 from an HP Elite Desktop to a Z420 but it won't boot. The card still runs fine in the DC7900 but the z420 hangs on the pre-boot screen and beeps after about 10-15 seconds. The power requirements for the GTX 750 appear to be the same as the existing FirePro 4900 so the 600w PSU should handle the GTX 750 without any issue. What could the problem be?