Have you tried the F2 key during bootup?
A downloadable manual if you don't have one with the machine.
Got a link to the manufactures website?
Yes tried all F keys, plus combinations. Google returns rubbish sites selling nothing to do with PC703 and ones mentioning manuals say they haven't got it, in the small print, after lots of adverts!!! As for the manufacturer the only label on the back is Made in China!!
Thanks for the suggestions though.