XPS 8910 died

Could be a lot of different things. For starters:

• If using a power strip or surge protector, remove those and connect PC directly to known-working outlet
• What color is power supply LED on rear of PC next to the power cord socket?
• What happens when you press power supply diagnostics button on rear of PC next to power cord socket?
• What color is the power button on front of PC when it won't boot, and steady or blinking, if it's on?

And try this:

1. Power off and unplug power cord from rear of PC
2. Press/hold power button on front for ~30 sec
3. Reconnect power cord to rear of PC
4. Try to boot with only mouse, monitor and keyboard connected

Nothing happens when you press the power supply test button?

Can you try a different PC power cord? It's a standard cord so you may have one on another PC, TV or appliance to try.

If swapping the cord doesn't help, it's sounding like the power supply may have died if pressing the test button doesn't do anything. You can search this forum to see what replacement PSUs others have installed in the XPS 8910 to get some idea of what fits inside the case and has sufficient wattage for the PC model's requirements...

 I forgot to mention, yes, I did try a different power cord that I brought from a Dell computer at work.   Absolutely nothing happens when you press the test button  or any of the other ones. 

 I also removed the CMOS battery as well as toggling the jumper. 

 I will look into getting a new power supply. Thank you for your help. 

You can try one more thing before buying a PSU, assuming your comfortable working inside the PC.

Paperclip test:

1. Power off and unplug
2. Press/hold power button on PC for ~15 sec
3. Open case and disconnect the main power cable from PSU to motherboard (#1 on motherboard diagram in Service Manual)
4. Stick ends of bent paperclip into the PSU connector to "jump" green wire to black wire. (Do not cut or remove any wires to that connector.)  You should see/hear fans and HDD spin up when you plug the power cord into the wall outlet. If not, given the other symptoms, PSU likely...

Post back and let us know when you're up/running again.

OK. I missed the last comment and ordered a new PSU. I swapped it out, following all the steps as listed in the service manual. I discharged any remaining electricity by holding the power button for 15 seconds. I plugged it in directly to the wall and...... nothing. Not even a green light on the PSU. 

I eventually tried the paper clip trick on the black and brown cables that was recommended and didn’t have any success on either PSU. However, when I tried it on the connector that goes to the motherboard and then plugged in the power, I got the green light on the PSU. On BOTH PSU's.

Black and brown? I suggested you jump black and green in the connector coming from the PSU to the motherboard...

Have you read this Dell KB article? You may have to strip it down to find the problem if both PSUs give the same results.

And there's always Dell's Out of Warranty Repair Service. You can contact them to get an estimate of the cost to repair if you can't find the problem or don't want to spend the time...

On my PSU the cables are black and brown.

Time to strip it down I guess...

Thank you, Ron! Stay tuned.

Did this ever get solved? I’m having the same issues.