My friend's PC crashed on him the other day and now it is in a loop of restarting and going to the windows recovery options. We want to eliminate the boot hard drive as the cause of the issue so he has plugged it into my PC. I've ran the error checking (right clicking, properties, tools, error checking) and have found nothing. I've also checked for viruses, is there anything else I can do to eliminate the boot HDD as the problem to this issue?