RE: No restart, optiplex 755 Small Form Factor Computer

Hi Nissim,

I would suggest you to restore BIOS to defaults. You may follow the steps below:

  • Power on and tap <F2> 3-4 times at Dell logo to access system setup
  • Go to ‘Load Defaults’ listed under ‘Maintenance on left side and press <Enter>
  • Press <Esc> to ‘Save and Exit’ from BIOS.

You may run the hardware diagnostics on the system to check for the hardware functionality. You may follow the steps below:

  • Reboot and press F12 to enter the Boot Menu
  • When the boot device list appears, highlight Diagnostics and press Enter
  • The computer begins to run the Pre-boot System Assessment, a series of embedded diagnostics that perform initial testing on your system board, keyboard, hard drive, and display
  • In case any hardware component is bad, you will get a corresponding error

Please refer to the link:

Keep me posted with the results. I will be glad to assist further.

Thanks & Regards
Amogh G
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