I have an old PC from 2005, just for nostalgia purposes. After adjusting the partition map of its main HDD and rebooting, the whole system locked up at the POST process. Even pressing Delete in order to get to the detailed POST log did not even work.
After rebooting once more, I managed to get into the "American Megatrends" POST log. I found out that the process stopped at the moment the main HDD (the one Windows is installed on) is detected.
I tried booting the PC with the Molex power cable disconnected from the disk. Lo and behold, it booted successfully to the secondary HDD I have installed, even if it does not have a bootloader installed (it at least showed that there was no boot media present). And no, it's not faulty RAM, I checked that too.
I have encountered POST processes being stopped due to faulty RAM, incorrectly installed expansion cards, faulty power supplies, but have never had a hard drive stop the process. I checked this post (mine may be a duplicate, but I highly doubt it) because the OP seemed to have a very similar problem. He stated there that he had to connect the HDD to another PC and rebuild the MBR. Is this what I have to do in order to get this HDD working again?