Greetings - two days ago, I accidently flashed the BIOS for my E6420 with the E4310 BIOS rev A09.
When the system restarted, there was no video and the LED's indicated Memory failure (Off | Blinking | Off). Also, the battery charging indicator on the outside was flashing RED.
After reading up on the issue and knowing immediately that I'd used the wrong BIOS, I decided that removing / reinserting the CMOS battery was the appropriate solution.
Having done that, now, I have no LED's and the system is stuck in a loop where the fan cycles 13 or so seconds, the system emits a low volume beep and repeats. This is true IF the A/C power is left connected. Once disconnected, it stops.
I've tried holding Fn key down while pressing power to initiate ePSA, but there is no change.
I've also tried forced ePSA with no results.
Any suggestions are welcomed.