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Solved: Dell Latitude boots into Diagnostic Mode every time

My customer needed his computer repaired. It was a Dell Latitude e6400 that had the following weird symptoms:

  • Power button does not work – The power button would not turn the computer on or off
  • Computer boots into Diagnostic mode – Every time the computer starts up, it would say “Diagnostic Boot Selected” and try to run through its diagnostics

The only way to turn the computer on and off was to unplug it.

After removing the hard drive, RAM sticks and keyboard then unplugging the CMOS battery, the computer still did the same thing. As it turned out the simplest fix worked.

Let the diagnostics start, hit escape when it’s available and tell the computer to reboot, quickly start hitting the F2 key to get into BIOS setup. Once in BIOS, click the “Load Defaults” button, Apply, exit, reboot. This fixed my problem, I hope it fixes yours.

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  1. October 29th, 2011 at 19:24 | #1

    This is strange. It’s always the quickest fixes that work though! I’ll note this.

  2. January 11th, 2012 at 17:11 | #2

    Dells can be such a nightmare especially the desktops i had a few that just would not play with XP with them ones took the hard drives out low level format normal format would not work because of the dell diagnosis stuff and when they were formated they worked really nice.

  3. June 10th, 2012 at 22:12 | #3

    this article just did the trick for me and my dell latitude hassled with it for a few weeks until i came across this blog and found this fix thank you

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