This post is my attempt to repay a tiny bit (byte?) of the help and advice I have received from this forum during the past couple of years. Recently the internal battery in my PC started to fail and after posting a help notice and reading all the info about the dangers of fiddling in the bowels of the tower I opened it up, cleaned out two and a half years of gunge, replaced the battery and reset the BIOS.
Without the knowledge gained from here I would not have attempted the task. Thank you everyone.