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HP Recommended
HP Z440 Workstation
Microsoft Windows 10 (64-bit)

Recently purchased a used z440 workstation.

Tried upgrading CPU to an e5-2667 v4, but would not post at all.

Reinstalled original e5-1603 v3, and I'm stuck with it boot looping.

The following displays and immediately resets,

"Mini QROM Display...

Initializing Intel(R) Boot Agent GE v1.5.50

PXE 2.1 Build 092 (WfM 2.0)"

I removed the CMOS battery for 5 minutes and pressed the clear CMOS button on MOBO for a few seconds.
I tried to pressing F10, F9, Del, Esc keys, etc. but it does not seem to recognize input.

Is there anything else that I can do?

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