You may be able to bring your PC back to life or at least recover all the files stored on it. Electrical power is not always our friend. Sometimes a voltage change can destroy a part of your computer, rendering it useless. An over‑voltage control device significantly reduces the risk, but there is still a chance. And yes, a power outage often ends with a voltage surge.
If an electrical disaster renders your computer unusable, you'll want to protect your data and then figure out what's damaged. It's easier and cheaper to replace a power supply than an entire computer.
If you don't have a backup of your data, recovering your library files is your top priority. Once you have your files back (assuming the damage didn't reach your hard drive or SSD), you need to understand which part of your computer has been destroyed. You can tell by how it fails to start.
If the computer fails to start at all—no lights, no sounds—the problem could be the motherboard, but it's more likely the power supply. If you have a desktop (tower) computer, this is a fairly cheap and easy replacement. You can buy power supplies anywhere, and you can probably replace it yourself.
I wouldn't recommend this if you have a laptop. Unless you are extremely skilled at it, otherwise it would be better to take it to a professional.
If your PC turns on, and then turns off again, it is likely caused by the motherboard. However, there is also a small chance that the information in the CMOS has become corrupted. To find out, locate the small battery that looks like a coin on the motherboard. Remove it, wait five minutes, reinstall it and reboot. You may be lucky.
But if that doesn't fix the problem, then it's definitely your motherboard. In that case, you should probably buy a new computer. A new motherboard essentially gives you a new computer anyway.
If you really want your old computer back, you can recover it with a motherboard identical to the original.
If your PC can boot to the BIOS screen, or displays an error message or just a blinking cursor, the problem is probably with your internal hard drive or SSD. You can replace it relatively easily. The hard part, if you don't have an image backup, is reinstalling your operating system and programs, as well as recovering your data files. You'll probably have to send the drive to a data recovery service and hope for the best.
