After upgrading my computer this rig sat in a closet for 6 months. I pulled it out a few days ago and it won't boot. The motherboard is an Intel DP67BG and CPU is 2500k. The hardware diagnostic led on the motherboard will not get past CPU initialization, memory initialization passes. The last POST code received is 1C, which stands for . The machine then reboots. My question is, what is the cause? The only thing different from when I was using this machine 6 months ago is the PSU and CPU cooler. I checked for bent pins and found none. Is there anyway to tell if it is the motherboard or the CPU? EDIT: In case case anyone from the future is seeing this, it turned out to be a dead motherboard. New one fixed the issue.