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I tried to find the BIOS, but couldn't anyway. Sounds as though I'd be better off leaving it alone anyway...
I left my office last week with the base unit on and the monitor off (allowing me to access remotely), it was OK up until this morning. However, having gone to the office, the base unit was off, hence why I couldn't remotely access. Can only think there must have been a power cut overnight...?
Anyway, remote access is now working again. Just hope the base unit doesn't switch itself off every couple of days. That was my concern.
Thanks for the advice everyone, I'll be back if anymore problems with it!