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HP Recommended
HP Z420v2
Microsoft Windows 10 (64-bit)

Somehow I must have switched a setting in the BIOS System Settings and now my HPZ420v2 won't allow me to go into System Settings, won't recognize the monitor (light remains yellow, never turns to green), nothing appears on screen. After about 5 minutes the fans begin to accelerate to nearly jet-engine level (just kidding). I am forced to turn it off. I swapped out graphics cards, returning to the original NVIDIA 2 DVI workstation card that the system came with - didn't make a difference. Tried a different monitor, no change, took the 800 Watt PSU out that had been working great and put the original 600 Watt HP PSU. No change in the behavior. Any ideas?

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