How to move the hard drive to another computer and not lose the bootable Win7?

Question

Iron

On a new self-assembly computer (AMD A10 APU, motherboard and hard drive - nothing else!) There is a problem: when the disk is working, sound is heard from the PSU (and two different ones). A cheap PSU continues to work, making terrible sounds, an expensive one goes into standby after about half a minute.
Test 1 - to move the hard drive to another computer - was a complete success. Winchester works without problems.
Now I want to conduct test 2 - rearrange my working screw there. With this, however, there are questions.
1. I have a BIOS, the new one is already UEFI. Will the computer boot up?
2. I have Windows 7. Will it survive the round trip?

Answer 1

for windows anyway.
turn yours on as bootable
the problem may be with some specific drivers (unlikely), but not with Windows as such

Answer 2

Бэкапы, нет?