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Boot Failure - Graphic Card or Power Supply?


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#1 plano_harry

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Posted 11 July 2015 - 02:21 PM

System was running fine, took a power hit and now it won't boot.  On POST, I get a long and 2 short beeps which I understand is a problem with the graphics card.

 

The old XFX HD-4850 graphics had 2 red LEDs (D1601-overtemp protection enabled, D1602-EXT 12V fault)  The fans all run and everything looks/sounds normal on power on, but the graphics LEDs come on immediately and I get the beep code for the graphics card fault.  Nothing on the monitor.

 

I tried an external power supply (Antec 430w) but did not see any change.  Will the external supply put out normal voltage if it doesn't sense a motherboard?  No guarantee the Antec power supply is good, just trying to see if my installed OCZ might not be damaged.

 

Wanted a new graphics card anyway, so I put in a new PNY Geforce GTX 960, but no change.

 

Any ideas on how to identify the failed component without a spare test system?

 

Config:

Gigabyte GA-MA770T-UD3P motherboard, OCZ 500w powersupply

 

Thanks in advance for any help you can provide.

 

Harry



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#2 mjd420nova

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Posted 11 July 2015 - 03:55 PM

Two possible outcomes from a power hit, surges are supposed to be stopped by the power supply but it can still allow over voltages to the unit before the PS dies.  This can really take out any an all components.  I'd start with the video card as it has to boot first before allowing any display.  The next would  a close inspection of the power traces on the MOBO to the slot(s) used for the video cards.  Burned board connectors for the card slots are suspect too. 



#3 plano_harry

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Posted 11 July 2015 - 06:25 PM

Nothing visible on the front or back of mobo






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