When I first got this PC, I left it on for a week just to ensure that it runs ok and then packaged it back up as a backup PC. When I set it back up recently, I found that it wasn't keeping CMOS settings (like time/date). I didn't check the optical drives as I rarely use them but I discovered one of them doesn't open. It just makes a grinding sound. I can use a paperclip to force it open, but that tells me something is wrong mechanically with it.The biggest issue I found it that it intermittently shuts down if I doing a a few tasks at once. If I just have it running one thing or play a vid it works ok. If I add opening a couple of browser windows and maybe playing a game it crashes to suspend mode. Windows logs show no error besides Kernel-pwr saying the system closed unexpectedly.I've been a PC tech and this is usually a power issue. I found the button battery read 1.5v when it should be 3V. I replaced the battery and it now keeps System time but still crashes. This is likely due to the old power supply. As PCs age, power supplies have a short lifespan depending on the manufacturer (most use cheap power supplies). I've built almost all of my other PCs and  by choosing quality parts, have rarely had failures. Dell having nonstandard components means there's no realistic cost effective way to get a known good replacement for an out of support PC.  It's past the 3 month warranty so I consider myself out of luck.My advice to any other purchasers is to test EVERYTHING and run max stress tests when U get reconditioned equipment. At least you can catch problems while returnable or under their warranty period.