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PC starts up, beeps once, but then shuts down,then will open again

Last response: in CPUs
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April 15, 2014 8:47:28 AM

but wont show anything on monitor.. This happens when i am using an AVR (automatic voltage regulator), then i changed my AVR to 750w still it happens.. I tried to plug my computer on wall socket and it worked fine..

I wanna keep using an AVR, can anyone help me please?
April 15, 2014 9:40:18 AM

i was using a generic AVR before i bought this radix model: MDR-750w

i bought the AVR because i thought it was the problem.. but still it when i start my computer it will beep once during the boot then will shut down after 3 second it will open again but will not show anything on monitor.. (this doesnt happen when i directly plug my CPU on wall socket)

SPECS:

processor: intel core i5 3470 3.2-3.6 ghz
mobo: gigabyte H77M D3H (LGA 1155) ddr3
Memory: 8gb (dual) ddr3 1600 corsair vengeance
Hard drive: 500 WDC Caviar Black
video card: !gb inno3d GTX 650 Ti Boost ddr5 192 bit
PSU: Cooler Master CM 620W Thunder M
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April 15, 2014 11:34:14 AM

Most computer power supplies have an AVR built in, is yours a backup power supply as well?
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April 15, 2014 5:30:55 PM

i dont know sir.. :(  my PSU has a switch though?
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April 16, 2014 10:45:44 AM

I couldnt find anything when googling the model AVR (radix model: MDR-750w). The cloest thing I got was this: http://www.pccomponentes.com/tacens_radix_vi_750w.html

Which is a PC power supply. Can you possibly find a website with the model in question so I can better understand?
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