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Computer turns on - blackness


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#1
rhymin

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Hi, I built a computer about 7 months ago, and have had no problems until today. I was on it, then all of a sudden the screens went black. The PC still has power but there is now no signal to the monitors. Now, I turn on the PC, and it sounds like it keeps restarting about every 20 or 30 seconds. I'm not familiar with this problem at all, is it a mobo problem?
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#2
phillpower2

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Hi rhymin
Can you provide the following details;
PSU (power supply unit) make and model.
MB make, model and any revision number.
Ram make and quantity.
Video card make and series name and/or number.
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#3
rhymin

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PSU - AZZA Dynamo 850 850 W ATX & EPS 12V 2.91 SLI Ready Crossfire Ready Power Supply http://www.newegg.co...N82E16817517003


Mobo - Asus M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard http://www.newegg.co...N82E16813131402


Ram - G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRM (I have 4 sticks of 2gb each for 8 gb total, also, when I built the pc one stick of ram was bad and I had to get a new one, worked fine after that) http://www.newegg.co...N82E16820231303


Video Cards - XFX HD-577A-ZNFC Radeon HD 5770 (Juniper XT) 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card ( I have 2 of these and they have been crossfire enabled since the day I built this.) http://www.newegg.co...N82E16814150447


I listed all of the websites from newegg so you can find them easier, thank you.
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#4
phillpower2

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First suggestion is try a known good power supply, it may appear to be working but as PSUs put out varying voltages +3.3V, +5V and +12V any one of these may be faulty and cause issues such as what you are getting 2nd Try each stick of Ram individually (do the same with the GFX cards) and 3rd as an outside chance try clearing the CMOS by removing the CR2032 battery on the MB and then replace it, reset the time and date in the BIOS if you get your screen back.
Leave the side off your case when you do your 1st test so that you can make sure all fans are working correctly.
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#5
rhymin

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You know what, when I had my ram problem, another guy here tested my psu and one of the voltages was faulty he said. I couldn't afford another psu at the time after building that expensive PC so I kept that one in there. It will take me a day or so to get a hold of another psu I can try. Thank you.
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#6
phillpower2

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Ok, it is not worth chancing any other tests just in case the PSU is bad and goes bang.
I will look out for an update when you are able to try the other PSU.

Edited by phillpower2, 14 May 2011 - 02:18 PM.

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#7
rhymin

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I just got my brand new corsair psu in and the PC does the exact same thing :)

I noticed the top fan wasn't spinning also so I unplugged the power from it and turned it on again, still the same thing.
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#8
rhymin

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I tried the 2nd step and tried each video card one at a time. Bingo. The card in the main slot is faulty. I'm now going to check if I'm still under warranty for this card, it's only been 7 months, so I am hoping so. Thank you so much for your help.
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#9
phillpower2

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No worries and thanks for the update :) I hope you are covered by warranty, let us
know how it works out or if we can be of any assistance.
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