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Dell XPS 720 Turns off immediately after being turned on

This is a discussion on Dell XPS 720 Turns off immediately after being turned on within the Motherboards, Bios|UEFI & CPU forums, part of the Tech Support Forum category. Hey, basically, came to turn on my computer this weekend after having not used it for a few days and


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Old 03-03-2014, 09:26 AM   #1
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Hey, basically, came to turn on my computer this weekend after having not used it for a few days and for some reason when I switch it on, it will power up for a second or too, then just switch off again straight after. All the lights will come on, the fan starts up, and the power cable is working (I've tried it on another machine and it also works with a PS3). I've also tried just having the power cable in with the monitor and keyboard etc removed and that makes no difference. The computer was working perfectly before I left it for those few days and I hadn't changed any software or hardware.

Just wondering if anyone had any input, thanks!
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Old 03-03-2014, 09:32 AM   #2
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Good possibility is the PSU.
How old is the PC and has any hardware changes been made to the original configuration?



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Old 03-03-2014, 09:45 AM   #3
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Its quite old, think it might be from around 2007/8. Probably should have mentioned it was my Dad's before mine and he had to have the PSU changed because he had a similar issue. Just want to be sure.
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Old 03-03-2014, 09:52 AM   #4
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Brand/Model/age of the replacement PSU?
Do you have or can you borrow a known working PSU to try?



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Old 03-03-2014, 10:05 AM   #5
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Just trying to find out those details now, is it possible to use a PSU from a newer pc?
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Old 03-03-2014, 10:14 AM   #6
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A PSU from a new PC should work if it has sufficient power.



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Old 03-03-2014, 10:43 AM   #7
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The XPS 720 is not a standard ATX PSU. It uses a 24 pin and a 20 main motherboard connector.
Manual here> ftp://ftp.dell.com/Manuals/all-produ...nual_en-us.pdf

What are the 4 diagnostic lights one front panel doing, are any or all lit?
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Old 03-03-2014, 01:07 PM   #8
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Quote:
Originally Posted by Wrench97 View Post
The XPS 720 is not a standard ATX PSU. It uses a 24 pin and a 20 main motherboard connector.
Manual here> ftp://ftp.dell.com/Manuals/all-produ...nual_en-us.pdf

What are the 4 diagnostic lights one front panel doing, are any or all lit?
Thanks, none of them are lit.
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Old 03-03-2014, 01:15 PM   #9
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Is the power light on, off, steady amber, steady green, or blinking amber or green?
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Old 03-03-2014, 01:40 PM   #10
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It starts off as amber, then goes green, and then it turns off.
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Old 03-03-2014, 01:47 PM   #11
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This model is tricky because the front I/O panel can fail and act like this, as can the motherboard(which they are known for) or the PSU. Do you have access to a digital voltmeter? We could try some voltage tests but they may not be conclusive.
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