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My motherboard is causing my computer to shutdown every 30 minutes.. It is not from any other hardware and has nothing to do with software. What can be causing this? Please help.

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.