I am not hardware savvy. I bought this premade computer: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
It worked fine for about a month but now it keeps black screen crashing when I'm gaming and it frequently won't power on properly. I'll try to turn it on and the lights come on and fans whir but it outputs nothing to the monitor, just started making a twanging sound twice, and will try to restart after a few seconds. If I unplug the power cord and USB devices it will usually manage to come on. All this happened in basically two days and it's going downhill from here.
When I have gotten an error code from it, I got BCCode 116, which points to GPU.
However, this is using a GTX 760 (min recommended PSU 500W) with what came with it: a Corsair CX 430 which is a 450W supply. I understand that gaming is what stresses the PSU the most with power spikes and have some idea that this could be manifesting itself in the error code as a GPU problem when it's really the PSU.
The manufacturer wants me to mail it back to them but I've read horror stories about that and since I'd have to pay for shipping I think I'd save money fixing it myself, wouldn't put the computer through the trauma of shipping, and anyway if it is the supply they'd just put another 450W in there. However, not being sure of the issue, I don't want to buy a new supply and discover that not only did I not fix the problem but I also voided my warranty.
I'm afraid of damaging other components in the computer which I know a failing PSU might do so I have turned it off and am not touching it anymore!