I just finished cleaning the inside of the case of my XPS8940 and when I restarted the PC i'm now greeted with a PREBOOT CHECKUP screen----I've NO Dell Support software on my machine and this is the first time in the 3years of ownership I've seen this---I clean th inside of my case every

I've NO idea how to stop this other than holding the ESC key when I power-up...

I've tried the following with NO success

FN key is not sticking

Secure Boot set to AUDIT MODE

Auto OS Recovery Threshold set to OFF

Support Assist OS Recovery is UNCHECKED

BIOS Connect is UNCHECKED

How do I get rid of this....No laughing please

FWIW-

Once booted up the PC works faultlessly

TIA 

LOU