Dell Vostro 3360 forgotten BIOS password

Hello,

I've forgotten my Vostro 3360's BIOS password. I've contacted Dell support, provided them with proof of purchase (scanned invoice), photos of the tags on the bottom of the laptop, screenshots of the password-entry screen (with 'Unlock key hint number') and the final Error - System locked + code screen. They gave me a password -- that does not work. Told me to try with an external keyboard, make sure I got the case of letters right, no Num-lock should be on, I should try entering the code with Enter, Ctrl+Enter, Shift+Enter. Nothing works. It seems I'm not the only one, e.g. http://en.community.dell.com/support-forums/laptop/f/3518/t/19528253

Is there anything more I can try? They said they cannot generate me another password, and as I'm out of warranty, I should get a quote from a Dell service centre. If a motherboard replacement is the fix, I might as well sell the computer as parts :-(

Thanks in advance,

Kofa