I've been getting this problem for the last 2 days now. I'll wake up and turn on my computer, it will power up OK, but it will show my monitor startup screen, [url]http://www.motherboards-reviews.com/images/Gigabyte_790XT-USB3_box.jpg[/url] my monitor will stop receiving any data and turn off and then my computer will just shut off. It will repeat this forever until i just cut the power. The way i fixed this was by unplugging all my USB devices and then turning on my computer. It works fine as it nothings wrong when i do this.
What i want to know is WHY is my computer only booting up when I unplug all my USB devices, and could it mean something is wrong with my motherboard or other parts of my computer.
Maybe you're very near your PSU's limit and the USB devices put it right over the edge. How many watts is your PSU - and what are your other specs - including how many HDD you have, capacity of RAM and how many sticks it is, etc.
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