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M6800 does not enter bios or one time boot menu stuck at PXE 2./1

My Dell Precision M6800 has been hanging and not booting sometimes on and off for a year.  I've managed to coax it into working before by unplugging everything and taking it out of its station.   Now it won't start up no matter what I do.  REMEMBER I CAN'T GET INTO BIOS.

What I've done so far

1. removed all storage/hard drives one at a time.  Primary, secondary, optical, mSATA

2. pulled memory, tried each stick by self.

3. unplugged coin battery with power plug disconnected and laptop battery removed.  Left unplugged for more than a minute.

4. cleaned everything with compressed air.

So now what happens when I press F2:

1. I briefly get the yellow "entering setup" on the upper right of the screen

2. Then I get two lines of text:

Initializaing Intel(R) Boot Agent GE v1.5.50

PXE 2.1 Build 092 (WfM 2.0)

The same thing happens when I press F12 except the yellow text changes to "Preparing one-time boot menu"

I've tried putting a freshly made windows 10 usb install media  in a usb  slot and the same thing happens

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