My mac book pro 17 inch , 2008 year , display went dark, and the steps in "everthing Mac" book did not work, any ideas?

my mac book pro 17 inch , 2008 year , display went dark after rebooting from origianl disc, and the steps in "everthing Mac" book did not work, any ideas?

The router might be bad or incompatible, but let's be optimistic.
On System Preferences, go to Network/Advanced/PPP. Only two items should be checked: Connect Automatically When Needed and Disconnect when switching user accounts. Uncheck everything else. Now, click Okay on the end of the page. The next time you're online, you shouldn't be disconnected.
If you still get disconnected like before, we might be dealing with a router issue - which can get rather complicated.

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