Software & Apps Windows 4 Common PC Problems and How to Fix Them A list of commonly seen computer issues and how to troubleshoot them By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated June 16, 2019 Windows The Ultimate Laptop Buying Guide Tweet Share Email There are thousands of problems that your computer could have, from an endless list of possible error messages to various hardware failures. Most of those problems might have several possible causes as well. Fortunately, the majority of these potential issues are rare. The problems most computer users encounter are common errors and failures, seen by countless others. That's actually great news because it means that chances are good that your problem has been well documented and can probably be solved by you! Below is a list of a few of the most common PC problems that we see from our readers: Computer Won't Turn On Blend Images / Hill Street Studios / Vetta / Getty Images Unfortunately, finding that your PC won't even start is a very, very common problem. Whether you mean that the computer is completely dead, it powers on but nothing happens, or it just never quite finishes booting, the result is the same — you can't use your computer at all. Luckily there's a lot you can do to troubleshoot this particular problem. Blue Screen of Death (BSOD) There's a good chance you've heard of, or seen yourself, the Blue Screen of Death. It's that all-blue screen with the computer code all over it that comes up as your computer "dies." Technically, it's called a STOP Error and there are many different kinds. STOP 0x0000008E and STOP 0x0000007B are two of the more common Blue Screen of Death errors. Here's some general advice for most BSOD errors, plus links to specific troubleshooting guides for some of the more common ones. "404" or "Page Not Found" Error Don Farrall / Getty Images A 404 error means that whatever page you tried to reach on the internet isn't there. Usually, this means that you didn't type the correct address in the browser, or that the link you used to try to access the page was wrong, but sometimes it could be something else. Regardless of the reason, there are several things you can try to get past this common error. A "DLL File Is Missing" Error © Elisabeth Schmitt / Moment Open / Getty Images Error messages about "missing files" — especially those that end in the DLL extension — are unfortunately very common. There are a lot of possible causes for these types of problems, meaning there are several troubleshooting steps you'll need to follow to cover all your bases. Fortunately, they're easy steps, and with a little patience, you'll have your computer back in no time.