Is your PC running gradually slower as time goes on? Is it already 'dead'? Don't go shelling out money for an all new PC just yet. Computers are modular and can be brought to a halt even if there is only a problem with one part. Would you purchase an all new car if your current one dies? Of course not! You would get it repaired by a mechanic. Here are some of the more common problems computers face that are 100% repairable by a professional.
Blue Screen of Death - The BSOD (or Stop error) is about as old as Windows itself as has been the bane of its users for years now. Its purpose is no different than any other error popup you encounter. It contains information on exactly why the system crashed. Typically this info can only be interpreted by someone who knows what they're doing though. The problem with BSOD related issues is that they can widely vary and there is no one-size-fits-all solution for it. This is why a technician is required in order to pinpoint and repair the issue that is causing the system to crash and throw up the BSOD.
Slow downs and lock ups - Computers have a knack for gradually slowing down the more you use them. This can be caused by a variety of reasons. However, almost none of them are permanent and you can indeed bring your computer back to the performance it had when you first purchased it. General causes of computer slow downs and crashes include malware infections, cluttered hard drives, junk files and software or 'bloatware', incorrect or outdated drivers, incorrect system settings or hard drive corruption.
Hardware issues - Sometimes it's the physical parts of the computer itself that can cause issues. Simply replacing the parts entirely is an option, but that can be expensive and you can get them repaired for much cheaper. Many issues are related to problems like faulty power flow, bad or broken cables, bad connections, shorted circuits or generally dirty conditions inside the machine.
Heat issues - Heat is the enemy of computers no matter what kind and it is one of the biggest causes of wrecked PCs and Macs. Although the components used to build computers can withstand very high temperatures that might seem too hot to us, even they have their breaking points. Having the thermal paste on your GPU and CPU replaced can alleviate some heat issues, but the biggest causes of overheating overall is the build up of dust or other particle residues on the internal parts of a PC. A thorough dismantling and cleaning can do wonders for a PC that appears to be on its last legs.
Overall, you should never ignore the issues your computer is having or hope they will go away on their own. PC problems can escalate and without proper maintenance you can end up with straight up irreparable machine on your hands. Don't gamble with your convenience and your most vital piece of technology.