My desktop couldn't reboot suddenly. I have some knowledge about computers (I built my desktops, repaired my laptops, etc.), so I discovered this issue first, ruled out that it was not SSD/operating system issue and realized that I needed a professional guy to help. I checked Yelp and found that RAD Computers is the first choice. I called the company and dropped by my computer there. Mark is very knowledgeable. He correctly figured out the problem, and helped me to order and replace the motherboard and power. He asks for a very reasonable price. He called me several times to keep me updated on the progress. He is very honest and reliable. I will recommend Mark to my colleagues and friends.