XPS 8930, no POST, single amber

Thanks for your response.

No, but the system had issues even right after I bought it two years ago that when it was moved, it didn't turn on. I don't remember what the amber code was.

Then, I  updated the system bios to fix it but the issue remained yet.

Now I  even tried to flush the bios and recover it manually with a usb and BIOS_IMG.rcv file, but the system does not turn on at all.

Please advice. Thanks.

Ehsan 

@Ehsan-NANO  -

If you're using a power strip or surge protector, remove those and connect PC directly to a working mains outlet.

You can try this:

1. Power off and unplug power cord from rear of PC
2. Press/hold power button for ~30 sec
3. Reconnect power cord to rear of PC
4. See if it boots now

And you might also try installing a fresh motherboard battery, CR2032, 3-volt coin cell battery.

If that doesn't help, try this:

1. Power PC off
2. Press BIST button on rear of PC, next to power cord socket, and see if the PSU status LED turns on.
3. The LED should be solid, not flickering or flashing, and the PSU fan should also go  up to speed. If the fan is not spinning up properly this should be considered a BIST failure even if the LED lights up.

• If the built-in self-test LED turns on, the PSU is able to deliver power to the motherboard.
• If the BIST LED does not light up, the PSU is not able to deliver power to the motherboard and could be caused by any component connected to the PSU or by the PSU itself. The next step is to isolate the source of the power failure by disconnecting parts from the PSU, see the Dell knowledge base article Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer.

Thanks. I have done all these steps. Nothing worked.

So you're saying the PSU passed the BIST test?

Are all external USB devices disconnected, except mouse and keyboard? Can you test a different keyboard and different mouse?

When you cleared BIOS using the CMOS jumper, did you put it back on the original pins afterwards?

Have you tried clearing BIOS, with PC unplugged, by removing the motherboard battery and pressing/holding the power button on PC for ~30 sec, and then reinstalling the battery? (Time for a fresh battery?)

If you remove all RAM modules and reboot, do you hear any beeps from the tower? If no beeps, suspect a motherboard failure.

If it beeps with no RAM installed, reinstall one RAM module using slot DIMM1 (second slot from the CPU). Does it boot now? Either way, swap each of the other modules into DIMM1 and see if it boots. If it still doesn't boot, test each RAM module, one at a time, in DIMM3 (first slot from the CPU).

If it still won't boot, strip it down to bare essentials. Disconnect all internal drives, except boot drive (HDD or SSD?) and remove add-in video card. Reset BIOS again by removing battery and pressing/holding power button for ~30 sec and then reinstall the battery. Connect monitor to one of the onboard video ports and see if it boots now.

BTW: Do you have a Dell OEM add-in video card or a retail video card?

you were asking: psu, motherboard, or cpu?  let us assume memory sticks are still good and you can verify them in another pc.

chances are one of the first two is the bad guy when NO POST.  cpu almost never dies.  motherboard issue can be myriad ranging from corrupted cmos to bent socket pin. all bad things but nothing you can fix yourself.  it is so bad that your only option in that case would be to get a replacement board. 

on the other hand, diagnosing bad psu is super easy.  just borrow a working psu from any old desktop and plug in to test your pc on igpu (remove video card).  If your pc suddenly posts again, you know.  if it still has no life, well it is not psu. then it has to be motherboard.