If your computer refuses to boot or tends to turn off without warning, see the Faulty Power Supply to Motherboard problem page for possible causes and solutions.
Whether you have disconnected all the boards and the problem persists, it seems to be a Power Supply (PSU) issue. Try to isolate completely the PSU and check the voltage. If it raises and suddenly cuts, the PSU has a bad component. I have experienced such an issue: when a component driving the tension output is bad, the current raises too much, and upstream the system detects a short.
crwdns2934105:0crwdne2934105:0
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what type of motherboard and what makes you so sure its a motherboard issue are you getting any error messages. Mac or PC
crwdns2934271:0crwdnd2934271:0 Jimfixer crwdne2934271:0
It is a Z77. I have tried removing all the hardware (except power supply and RAM) and the problem continued. It is a PC. No I am not getting any error messages. Windows.
crwdns2934271:0crwdnd2934271:0 Mert YILMAZ crwdne2934271:0
AS Rock LGA1155 DDR3 SATA3 USB3.0 Quad CrossFireX and Quad SLI A GbE ATX Motherboard Z77 EXTREME4 http://www.amazon.com/LGA1155-CrossFireX...
crwdns2934271:0crwdnd2934271:0 mayer crwdne2934271:0
Is it overheating? What indicator lights do you get when it powers down? How long before you can restart?
crwdns2934271:0crwdnd2934271:0 mayer crwdne2934271:0
If you know it isn't the software or other hardware, you should have the answer already. I would still suspect other hardware such as the cpu cooling fan. If it has stopped or is not running at proper speed or there's a lot of dust in the heat sink, that could cause the system to shut down.
crwdns2934271:0crwdnd2934271:0 emplehod crwdne2934271:0