I have had the HP ProDesk 600 G2 Small Form Factor PC, Intel Quad Core i5-6500 for 3 days and it will be going back. It is obviously defective.At startup it booted fine, It went into a typical Win 10 setup. The system registered a valid Windows license, and fully patched and updated itself over the next 24 hours. So far it was very good. The surprising good news was that this system is eligible for a Win 11 upgrade.The issues I ran into was trying to boot to other media. I intended for the system to be my next Linux Mate system. My previous 4 Linux mate systems were recycled HP machines so I am quite familiar with the setup.I intended to keep the functioning Windows SSD offline and I installed a replacement SSD. The issues began with trying to boot from USB boot media. The system would not recognize it. I could not get into the F-9 function to select the media. I could not get into the BIOS to see if some further attention was needed - such as ‘secure boot’ parameters. When I use the supplied SSD it boots to Windows OK, but will not boot to other boot media, nor allow me into the BIOS setup.Not being able to use other boot media, or get into the BIOS at boot time, was a stopper. Not only could I not install Linux, I would also not be able to perform a clean install of a replacement Windows drive if needed. Nor would I be able to perform a clean install of Win 11 when the time came. Getting into the BIOS is a necessity. It would not boot to USB boot media or DVD boot media.I contacted the support folks at Abyses.com and they could only focus on the word Linux. Even though I told them that Windows boot media also will not work. If any of you have similar issues, I strongly advise you not to use any mention of anything but Windows.