Corsair CX600w PSU

SPECS : I5 - 4690 asrock h97 m-itx ac 16 gb of ram R9 280 Corsair CX-600w I've owned this PC for 5 years, and was working fine up until a few months ago. I noticed that it started crashing every two to three hours. Since this wasn't all too much of a big deal, I ignored it. Then it started...

I just built my first computer and am trying to install windows 8.1 64bit to my ssd but I get a message saying that it can't write to that disk and that i need to enable disk controller. I've googled this problem and even read forum posts on toms hardware about it. I have made sure its ahci and...