Windows 8 giving signs of something failing

I'm guessing the hard drive is corrupted. The first thing to try is the Windows 8 RECOVERY method.

Go down to "Booting Windows 8 In Safe Mode When PC Is Not Starting":
http://www.redmondpie.com/how-to-boot-into-windows-8-safe-mode/

If you have a recent RESTORE POINT I recommend trying that before the auto repair method.

Alternative:
Since you installed via USB, if you can boot into it again it should also give you the recovery options since it's the same as the DVD. The BOOT ORDER in your BIOS must have USB as first before Hard Drive though.

Other:
1) Confirm you can boot into your BIOS and that the screen isn't doing weird things. (If it is you have a more serious problem which MIGHT be your video card).

2) Run MEMTEST
 

FindingLuis

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After taking it all apart and inspecting the pieces carefully, my computer will no longer turn on. This may probably be a PSU failure, I'll have to order a new one this Wednesday to see if that is that case. My current PSU may also be under warranty. I'll have to look into this.