I have a PowerEdge T20 with Arch Linux installed. I rebooted to try to boot from a USB disk, but the system enters Gnome desktop without showing any POST screen.
I have an old 17" monitor that I'm booting with, which I believe should rule out any monitor/resolution related issues. I have tried holding down F2, F10, F12 etc on boot, and I have tried removing the power cord for 15 seconds and cold booting. The POST screen simply doesn't show.
What other troubleshooting steps can I try?