Hello,
we bought HP ProDesk 600 G1, with Win 8.1 Pro license. Users were complaining about slow work, so we upgraded with HP Quadro K200 graphics and SSD. As cloning of Windows OS disk to SSD didn't worked out, I installed freshly Windows 8.1 Pro on SSD, and now I can't activate windows, receive error: 0x8007007B
I thought it will read Windows key from BIOS, but nothing. I checked with Read/Write Everything - ACPI - both SLIC/MSDM tables, but no Windows key is written there...
it is HP ProDesk 600 G1, p/n: E7P49AW, s/n: will send to HP support