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Computer powers, but no video signal or POST

Tags:
  • Homebuilt
  • Computer
  • Video
  • Systems
Last response: in Systems
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August 25, 2012 3:37:24 AM

Computer powers, but no video signal or POST the build is about 3 years old and has had no recent changes to it.

Turning on power, all fans and motherboard LEDs turn on, but neither of my monitors gets any video signal and I do not hear a beep to indicate that the POST test has passed.

Here is what I have done so far:

reseated the graphics card
reseated the RAM modules

attempting boot without the graphics installed gets me a long beep followed by 2 short beeps (indicating no video path was found)

I have verified that my RAM is not at fault as without it the POST returns several long beeps as expected.

I have also verified my PSU both unloaded and under its full load and all pins return their expected voltage under both conditions.

I am thinking that this indicates that my graphics card has gone bad (it will power on and its fan does start up)

can anyone confirm this based on what i have done so far?
Any input or further suggestions would be very helpful

Thanks

More about : computer powers video signal post

a c 136 B Homebuilt system
August 25, 2012 5:34:43 AM

There is a troubleshooting thread at the top of the forum

I think your graphics card is the least likely suspect , since removing it gives you an error indication

Same with the RAM

I would try resetting the BIOS by removing the battery for 10 minutes
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August 25, 2012 6:44:45 PM

Tried resetting the bios but there was no change. My motherboard doesn't have an internal video path
Specs:
Cpu: core i7 920
Motherboard: MSI X58 Platinum
Ram: 6GB, triple channel
Graphics: Sapphire Radeon HD 4780 1GB
PSU: thermaltake 700 watt toughpower
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