Hi, I had already reset Safari earlier this week. When I went into the HD to look for the preference list file for Safari I couldn't find it. I have now reset Safari again and it has opened OK for now. Maybe we do just need to upgrade to a later OS X. The hardware spec is:
Model Name: iMac
Model Identifier: iMac4,1
Processor Name: Intel Core Duo
Processor Speed: 1.83 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: IM41.0055.B08
SMC Version (system): 1.1f5
Serial Number (system): CK6270LGVGZ
Hardware UUID: 00000000-0000-1000-8000-0016CB87651F
Thanks - I found the right file by the method above - never noticed the Go to at the top of the screen before! I have deleted the previous preferences for Safari into the trash box.
The link you sent is for US and we are in the UK, so I will close down Safari when I've sent this to you, then open it again and look for the same file from Apple but in the UK version to order the software update. Then I just need to hope my 91-year-old mother remembers what her password ***** ***** this computer!!
Thanks for your help.