Imac 500dv won't connect to internet

Hi, I'm trying to help some friends out, I gave them an imac 500DV (grape?) a year ago and they haven't been able to connect to the internet. They are disabled and unable to work so money is tight, for this reason they chose Talk Talk broadband which is free with their phone contract but is known in the UK to be far from the best and badly organised. Also neither of them has a good knowledge of computers and have wasted time with the Talk Talk helpline. It had connected fine when I had it, I did a clean install of 10.2 before I gave it to them too.
I am visiting them for a day after new year and I want to get it working for them or at least find out if the problem is with the computer or the broadband provider.
They are currently running 10.2, I plan to put 10.3 on there when I visit, I'm hoping his will help as I know originally there was a line problem and many computer setting were messed with before this fault was recognised. I'll then try what I know and phone the helpline myself to see what they recommend.
Basically I'm wondering if someone could give me a list of checks I can run through (on 10.3) to see where the problem is. I might change the PRAM battery too while I'm there as it's never been done and may well need replacing. How do I do this on the old imac?
Thanks in advance for any assistance,
James

Here's a link to info about how to get at the guts of an iMac. (Since you are in the UK, no need to "translate" terminology like 'cruciform screws'!) It covers battery replacement as well as a lot of other stuff.
http://www.sterpin.net/uk/imacslotinukp.htm
As for the broadband connection, my experience (in Canada) is that the OS installer looks after it. I have seldom had to fiddle with anything. After the OS installation, which is done with the computer connected to the internet, you are prompted for personal info, including how you connect to the internet. Once the info (ISP provided user id, password etc.) are entered the connection is done for you. If that does not work, there are steps you can try. The easiest and the best is the OS 10.3 included "assistant" that will, if necessary, trouble-shoot the connection process. It goes through the 'list of checks' that you need.
Good luck.

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http://support.apple.com/kb/HT2712
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Message was edited by: littleshoulders

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Learn about Safari 5.1.7 and Leopard Security Update 2012-003.
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Mac OS X 10.5, Product Security, Safari 5.1 (Mac OS X 10.6), Safari 5.1 (OS X Lion)
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Imac 500dv won't connect to internet

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