Hello, and thank you for your time. I have an HP Phoenix H9-1350. Only difference with mine and factory specs are I only have a 256GB 850 Pro installed and i upgraded the GPU to an XFX R9 280x. Today, I was downloading some files and an error popped up stating "action couldn't be performed" due to an I/O error. I restarted my PC and Windows 8.1 wouldn't boot. I put in the Windows DVD and tried to boot from DVD so I could do a system restore, but I couldn't get it to work. After several restarts, now my PC power light is blinking amber which, upon further investigation, means my PSU is done? Can anyone help me with this please? Thanks in advance!