BIOS boot problem

I think my old 2008 homebuilt Abit pc is finally coming to the end of
its journey. It has started hanging on the boot at the truck picture
logo (where you have the option of Delete-ing into the BIOS). I could
press Enter or Tab a few times and it would stagger on, get to my BCD
menu and then boot successfully any OS I wanted.

 I replaced the CMOS battery and all was well -  for a day, next AM it
hung again, first boot of the day. The  old battery measured 3.2v
after I removed it. The new one had measured 3.3v before I put it in. 

I don't think I cleared the BIOS, just stuck the new battery in.

Anyone, (Paul?) have any ideas how to save my precious old sweetheart?