Reimage is a Windows Repair software and so the focus on the detection of hardware issues is limited. Based on their vast experience in PC repair - they’ve realized that most PC issues are related to software. The elimination of so many software issues will allow you to isolate and diagnose many hardware failures.
If your free scan analysis turned out to be 100% all clear and you’re still experiencing issues - you probably have some kind of a hardware problem and they suggest that you go to a PC repair technician.