I got my PC about 2 years ago, and it was custom built. It has had some problems in the past, but they were all fixed. Last night, a problem showed up saying "Windows has detected a hard disk problem". I backed up all my files onto a external hard disk, and restarted the PC. Then I checked for any disk errors, but as my computer was booting up, it said there were no errors. The message keeps popping up, and I don't know what to do! My hard disk is "Samsung HD502HJ ATA Device".