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Last reply by 07-08-2017 Solved
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Dell XPS 8700 No Power

Have a Dell XPS 8700 that I purchased in October of 2013.  The other day while my daughter was doing her homework the tower just shut down.  Will not power up at this time.  The green light on the back of the power supply is not illuminated.  The yellow "Aux Power" light inside of the case is on. 


When I press the reset button, next to green light, on the back of the power supply the light comes on the fans in the case operate an the optical drive powers on.  So, is it the power supply or is the motherboard kaput?  Or is there some waay to reset things?  Tried the "hold power button down for 25 sec" thing to no avail and also left it unplugged overnight.

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3 Zinc
14876

Remove the CMOS battery located on the motherboard. Leave it out for a few seconds then put it back in. Try booting up the computer after. The green light on the power supply shuts off while the computer is not powered on. Since the light does turn on and things spin up when you press the test button your power supply should be fine. It could be your motherboard, before we know try resetting the CMOS battery like I mentioned above. Hope this helps!

-Brandon

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

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Replies (14)
3 Zinc
14877

Remove the CMOS battery located on the motherboard. Leave it out for a few seconds then put it back in. Try booting up the computer after. The green light on the power supply shuts off while the computer is not powered on. Since the light does turn on and things spin up when you press the test button your power supply should be fine. It could be your motherboard, before we know try resetting the CMOS battery like I mentioned above. Hope this helps!

-Brandon

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

2 Bronze
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14876

Removed the CMOS battery, same lack of results.

10 Diamond
14876

If you're using a power strip or surge protector, try removing those and connect PC directly to a known good wall outlet.

Ron

   Forum Member since 2004
   I'm not a Dell employee

3 Zinc
14876

If what Ron posted above does not work, you may have a bad motherboard. If the PC is under warranty I recommend contacting Dell support and having them create an onsite repair for the desktop, that way you can get up and running as quick as possible. If it is not under warranty, Dell might sell (refurb) motherboards for your desktop and  you can purchase one from them, or look on websites like Amazon, Newegg.com, or eBay. eBay and Amazon you have to be careful on, Newegg.com has recently just started carrying a bunch of OEM stuff through third party sellers on their site, and most third parties appear to be actual online stores.

-Brandon

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

2 Bronze
2 Bronze
14888

Unfortunately seems like a new motherboard is in order.  Purchased a new power supply to no avail.  Called Dell, none available.  The only place that I can find one is eBay.  Not sure I want to pay $180 on a used mobo.  Although would be less then purchasing a new computer.  Problem is, I want to keep running Win7 as I have no desire to go to 8.

10 Diamond
14888

Before rushing out to buy a new motherboard or PC, you should check all USB ports to make sure none of them is bent or otherwise shorted. 

Power off, unplug and press/hold power button before for ~15 sec. Use a flashlight to examine all ports. If any of them is bent, use a non-metallic item (eg, toothpick) to gently bend the contacts so they're no longer touching each other. Then see if it boots now.

If not, power off and press/hold power button for ~15 sec. Strip the system down to bare essentials by disconnecting all drives except boot hard drive, remove all PCI-e cards except video, all RAM modules except the one in slot 1. Then remove motherboard battery and press/hold power button for ~30 sec. Reinstall battery and see if it boots now with only mouse, monitor and keyboard connected.

If still not, remove remaining RAM module. If you don't get any beeps when you boot, the motherboard is toast. If it beeps, there might still be life in the motherboard. So then disconnect the hard drive and video card and see if it powers on...

Ron

   Forum Member since 2004
   I'm not a Dell employee

2 Bronze
2 Bronze
14888

Thanks for the additional suggestions Ron, unfortunately once the new power supply was installed only had the P1 and the 12v powerconn1 connected, all RAM out except stick 1, HDD unplugged, Video Card removed and still DOA. No beeps, no lights, nothing. Did check the USB ports, per your suggestion, and they all look good.

Thanks everyone for the help, much appreciated.

The part that I don't understand is that if it's the mobo, then why when I press the "reset" button on the power supply the chipset cooling fan and video card fan operate?  You would think if the mobo was bad those wouldn't operate.  Is it possible that the mobo is fine and that the chipset is bad??

10 Diamond
14888

You don't need the motherboard to do anything more than conduct power from the PSU to fans when you press that reset button. It's odd the new PSU (assuming it's good) shuts off too. That typically means there's a short circuit somewhere.

Can I assume the CPU power cable is correctly connected to motherboard?

I guess it's possible there's a fault in the front panel. Either in the switch module or the connector to the motherboard. You may want to check that the connector cable is correctly attached at both ends.

Don't know how much more time and $$ you want to put into troubleshooting...

Ron

   Forum Member since 2004
   I'm not a Dell employee

2 Bronze
2 Bronze
14888

I had a similar issue with my XPS420.  Yellow power light on inside and pressing the reset on the power supply caused the fans to come on. But, if I held the reset on the power supply and pressed the power button it would boot.

My wife broke the USB port and one of the pins (probably the 5 volt pin) shorted to the connector case.

Once I removed the pin the computer booted fine.

Hope that helps.

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