Hi, I hope someone can help with this.   I want to run the Dell diagnostics on my Inspiron.  F12 was not working to take me to the menu.  I Googled it and found advice on adjusting my Function Key Lock Options.  I restarted the computer, started tapping on F2, and entered BIOS.  I found the Fn Lock Options and disabled Function Lock.  I then tried to access F12 again with no luck.  I also fully played around with the Fn Lock.  I checked the box 'Lock Mode: Disable/Standard' With both the Fn Lock on and off.  No luck.  I checked the box for 'Lock Mode: enable/Secondary' with the Fn Lock on and off.  No luck with all 4 combinations.  I then noticed that when the computer was starting up and the Dell logo would display momentarily, I didnt actually see the prompts for Setup and Boot Menu.  Perhaps it was being missed.  So I again entered BIOS and and extended BIOS Post time to 5 seconds.  Now, when the computer starts up and the Dell logo appears, I am able to see the option for F12.  I have tried tapping on it repeatedly,  holding it down, and using the Fn key with F12, all with no luck.  The F12 option will not engage.   Any advice ??