Mac Book Pro won't wake up from "sleep mode"

After putting laptop to sleep last night, I wake up to a computer in "sleep mode"
The screen is black and not responding, the sleep indicator is lit steadily (not slowly blinking as it normally does in sleep mode) but the computer does not seem to respond to anything. Screen stays black. Does anyone have same issue? I was told that the video chip is shot but I am not sure. Any advise would be appreciated. Thank you.

An accumulation of old wireless networks you have joined can cause similar symptoms. If you can get the computer running, do System Preferences > Network and select the Airport connection, then click the "Advanced..." button. You should see a window listing all networks you've joined. Delete all except those you use on a weekly basis. Restart and try letting it sleep.
When my Late 2007 MBP had the same symptoms as you describe, the system log showed it was try to connect to a lodge network miles away where I stayed a few weeks before. Deleting about 30 unused networks accumulated during months or travel fixed the issue, and it's not recurred, because I kno keep the list tidy.

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