IMac OS X 10.5.8 my mac works fine until I try and connect to the internet then it switches itself off. has anyone had anything similar ?

I can be on the mac for I can be on my mac for hours or ten minutes but as soon as connect to the internet it turns off completely every time
Help please

Anyone out there?
I thought this would be a no brainer for the right person.....
I hate to spend hundreds of dollars I don't have just to take it in and have someone else do something I am perfectly capable in doing, given the right advice and direction.
I would love someone's help if you are truly knowledgeable in your field?
Thank you kindly...
Regards

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From the menu bar, select
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Below the "OS X" legend in the window that opens, the OS version appears. Click the version line twice to display the serial number. If the number is missing or invalid according to this web form, take the machine to an Apple Store or other authorized service center to have the problem corrected.

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See:
* http://kb.mozillazine.org/Firefox_crashes
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Sorry, I do not have a solution for you but I have the same problem upgrading from Jaguar to Panther (on my home machine not listed which is a G3 b&w). Now my WMP54G doesn't see any wireless network (I used to be able to see several in the 'hood), and Apple Profiler recognizes the card. Apple updater changed the Airport system files, I believe.
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highFly376

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Then you have an Airport Express that is set to "Extend a wireless network" which you selected the name of your network in the box...
Correct?
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http://support.apple.com/kb/HT4259?viewlocale=en_US&locale=en_US
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Thank you for visiting Apple Support Communities.
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daolbuzzard1 wrote:
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Anyways Good luck,
Wannabe

IMac OS X 10.5.8 my mac works fine until I try and connect to the internet then it switches itself off. has anyone had anything similar ?

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