Hey guys looking for some input. I went to boot my PC this morning, no go Asus Qled showing a A2 error. System 1 Asus z68 Deluxe i7 2600k 16Gb (4x4) 2133 CL9 G.skill DDR3 MSi 980ti XFX Black ed 750w PSU 2x 500gb 840 evo 3x HDD So I checked cmos battery, 3.3v so that's ok. I pulled the GPU and put it in a Phenom x6 system and that booted fine. Gutted the entire case and set it up on a outside the system. the problem persisted. I decided a motherboard swap, I have a spare identical board with a i52400 in it. So I swapped the CPU's and booted the 2600k and new board, same issue. Switched to the 2400 & the old board, the same issue. Decided to dig out a old GTX770 it booted, powered down replaced the 980ti and now it boots. I did the same GPU swapping method with 2400 system exactly the same results it finally booted after the 770 was put in the system. Do you think the PSU is on it's way out? Don't have a spare sitting around and not keen on gutting the Phenom rig.