gengiscant, Thanks for your reply and apologies for the delay. The problem is on my brother-in-law's machine and I've had to wait for him to download and run the Belarc software that generates all the information about his machine. This he has now done and he has liasted the following:-
Following your advice, I loaded Belarc and the main circuit board is:
Board: FUJITSU SIEMENS D2660-A1 S26361-D2660-A1 Serial Number: B056B843 BIOS: FUJITSU SIEMENS // Phoenix Technologies Ltd. 6.00 R1.02.2660.A1 06/26/2007
It also mentioned under controllers :
Standard floppy disk controller Intel(R) 82801GB/GR/GH (ICH7 Family) Serial ATA Storage Controller - 27C0 Primary IDE Channel [Controller] Secondary IDE Channel [Controller]
Regards and thanks again for any guidance.