Can I thank everyone who has posted responses to this query, I can say that my friend has found the correct sequence of keys to access the boot menu, it does appear to vary widely depending upon the actual model, also needed to go through secure boot ...
Can I thank everyone who has posted responses to this query, I can say that my friend has found the correct sequence of keys to access the boot menu, it does appear to vary widely depending upon the actual model, also needed to go through secure boot option, but I think this is now sorted.He is very appreciative of the help and has learned a lot.
Degsy