Just thought I would give my update on this topic.
The booting using the A10 processor (officially not supported by the motherboard with F1 BIOS) was hit and miss at booting up, with the monitor displaying 'NO INPUT'. It would boot after 5 or 6 attempts, but was not very stable. Even then, when output was there, the machine reported a corrupt BIOS and had to correct it BIOS from the backup BIOS.
I had an A6-6400 processor from my previous machine, but this would not boot at all!!
I decided that something should be done, so I carried out the suggestions from the link supplied by 'Tiger', and made a DOS bootable memory stick. Downloaded the F5 Bios, and added it to the stick. When I eventually got the computer up and running, I entered BIOS and set it to boot from the memory stick. It did this, updated the BIOS (both of them) and then booted into windows as normal.
I know that Gigabyte say you should use a processor that will run in F1 BIOS, but I had to take the chance. Everything now running as normal, touch wood.
So my sincere thanks to all concerned.
Regards
GerryD