Hello, when I power up my PC I run into this error. But when I plug the HDD in my brothers pc it boots perfectly. I tried swapping cables and tried all the repairing but no luck. It doesn't seem to be broken since it works everywhere else. The last thing I did was go into msconfig and set the boot to safe mode cuz I had to install something and when I restarted it goes to this bootmgr is missing. Any ideas?