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Dell XPS 720 does not boot

Dell XPS 720 does not boot

Dell XPS 720 does not boot

(OP)
Hi all

I have XPS 720 desktop machine for almost 2 years now. Recently I found the problem with the graphics card(Geforce 8800 GTX dual card with SLI). some coloured lines on screen all the time and wrong characters on the screen.

So I read somewhere about resetting the graphics card and tried to find how to physically reset the card. but couldn't find anything on the card. Then I reinserted the cards, but There is no display at all this time. I thought I should get the new cards and bought two Geforce GTX 460.

But still there is no display at all on the screen. I tried removing all the peripherals, clearing the CMOS  but No joy.

Please help me if you can.

Thanks
 

RE: Dell XPS 720 does not boot

Do you have a cheap PCI graphics card that you could try?  Unfortunately you jumped to the conclusion that it was a video problem (which it certainly might be), but I wouldn't have bought any new video cards until I had 100% proof of that.

Have you tried a different monitor?

Can you see any of the POST messages?

Can you try to boot with a boot CD (linux or otherwise) to see if you can get any video on the screen.

RE: Dell XPS 720 does not boot

(OP)
Yes I certainly tried a different monitor, Linux ubuntu. There are no POST messages or signals. In fact I suspect the POST itself does not finish. Because keyboard light flashes at the start up but keyboard doesn't work after that. and no display at all.

 

RE: Dell XPS 720 does not boot

Pull all the memory out.  If the machine doesn't do a beep code - it's the motherboard, as long as you trust the power supply.

Last effort:  You COULD pull the motherboard out of the case and leave only memory, processor/fan, video card and power supply connected and try it that way.

Then try a different power supply out of the case.  If no joy with all that testing, then motherboard is dead.

RE: Dell XPS 720 does not boot

(OP)
You are right. the motherboard is dead. I  have already tried  these steps.
Thank you.  

RE: Dell XPS 720 does not boot

I keep a PCI video card (relic that it is) and a laptop in my bag of tricks that I can use to test for video issues.  I guess pretty soon, I'll need a PCI-E video card.  But, yeah, sounds like it's dead.

Odd because normally the "colored lines on the screen" symptom is related to a video card croaking.

RE: Dell XPS 720 does not boot

(OP)
This might be the result of faulty graphics cards. Because both cards goes to very high temperature, one couldn't imagine. I couldn't touch the cards for 10 min after shutting down the machine. Is that a normal?

RE: Dell XPS 720 does not boot

If my graphics card was getting that hot, I would certainly want a model that had a built-in fan.  That seems way too hot though for normal conditions.

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