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Hi, my brother's computer was overheating last summer and it did shut down a few times because of it. Now I was away overseas and told him to take it easy and I would look into it. Another thing was that occasionaly it would not start up. The CPU Led would light up and it would not post. Fan and all had power, but no post. I returned and changed his thermal paste which did fix the overheating issue. The CPU red light still appeared. When this happened it would not post. He had to unplug the power for a few hours and the try to boot. It sometimes would post etc and it would work unless he shut down. Then the issue might appear again. Now his PC consisted of the following: AMD 8350 8 core at 4GHz PSU with noctua NH-U9B cpu cooler ASUS M5A99X Evo R2.0 mobo Corsair CX600M PSU Sapphire Dual-X R9 270X GPU 16GB RAM and 256gb SSD. Now trying to troubleshoot this error, I read somewhere that the CPU Led would light up when CPU is not present. So anyway he was in a hurry to get his PC fixed and so we did not bother with sending the mobo back, and we ordered a new mobo. We now have the ASUS Sabertouth 990FX R2.0. So I installed the mobo today. I started a new clean install of windows, and after the first shutdown, the post issue appeared again. So we get a CPU Led and no post again. Now the thing is that we could not have two failed mobos. So my thought is that it might be the CPU. The heating issues that he had might have cooked it or something. He wants to get a new CPU. My question is. Can we diagnose this issue? Is it really the CPU? And if it is, then we want to get the AMD FX-9590 4.7GHZ 8-CORE BOX. Now the previous CPU needed 125W, and the new AMD FX-9590 4.7GHZ needs 220W. If we do end up getting the new CPU, will the system handle it? Will the PSU handle it? Can you recomend a cpu heatsink to go with the AMD FX-9590 4.7GHZ? Cause my guess is that a cooler needs to be able to take 220W psu heat right? Any thouhgts or direction would be appreciated. thank you