It worked great until something happened during an update (not sure what). Pi had been set to boot from USB and worked fine. It now hangs during startup and, depending which USB drive unit (SanDisk 32/64/128) I use, it shows the skeleton screen or a blank screen or a flashing combination of both ultimately resulting in the "NO SIGNAL" on the HDMI screen. This happens also while trying the SD card slot as well. I have re-imaged the EEPROM (it shows a green screen), re-imaged several iterations of the OS and tried booting from the SD card slot as well as USB - no luck. All my other PIs work great - using the same HDMI screen, all using CanaKit power supplies and cables.
What I want to do is to apply a full factory reset to clear whatever BBs (BadBits) are rolling around inside and start over with it again.
Is there a way to do a total reset back to factory, Out-Of-The-Box condition?