Display flicker then lock-up?

I have a 2007 MBP and within the past week the screen has, on occasion, stuttered or flickered then locked up to the point of requiring a reboot--audio has continued to play if I was watching something at that time. In each case, I can say that I've been online and the MBP case has been hot. Is this indicative of a failing fan or video card? Whats the best practice for testing for this possibility? (And if so, how easy is it for someone to replace--I've replaced RAM and a hard-drive in MacBooks before but not a fan or vid card)
Any thoughts are greatly appreciated in advance. Thanks again.

I've replaced RAM and a hard-drive in MacBooks before but not a fan or vid card)
There is not video card--the video hardware is soldered to the logic board. The Apple Repair Extension Program that S.U. linked replaces the entire logic board.
The nVidea failures were commonly linked to high operating temps. Games with heavy-duty graphic demands really run up the temps.
There are several things you can do to mitigate heat issues:
1) See if any background processes are eating up CPU cycles. Quit all running user applications so the computer is at normal idle. Find Activity Monitor in Applications > Utilities and launch it. If you've not run it before, change the "Show" pulldown at the top of the AM window from its default of "User Processes" to "All Processes." There is a column for "%CPU." Click that column header to sort by CPU usage.
If any process is using more than about 25 percent of the CPU cycles while the computer is idling, post the names of the processes and we can see if they can be eliminated.
2) Make certain your physical arrangement of the computer and your usage patterns are not contributing to overheating. Apple recommends against using the MBP on your lap or any surface that contacts the case bottom. The case bottom is part of the heat dissipation system and needs need air.
If you need to use the computer in your lap, make a simple lap board from scrap plywood ot an old serving tray. The height of the rubber feet is usually enough to let the air move but, if you are playing graphics-intensive games, you may want to insert some 1/2-inch (13mm) spacers, or get a powered chill pad to help move heat away.
The main exhaust vent is under the display hinge on the back panel of the case. It must not be obstructed.
If using an external monitor, avoid "clamshell" mode (internal display closed). A lot of heat can escape from the keyboard area if you leave the lid up.
Here is an Apple article on temps but it does not list critical temps for any model:
http://support.apple.com/kb/HT1778

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I am facing a display flicker issue on my Lumia 830 on zero brightness setting (upto brightness at 20%)which is easily noticeable in the dark & also slight flicker when set to auto-brightness mode similarly in low -light or dark environment where the display automatically adjusts itself to minimal brightness setting.
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Hi,
It's a little confused about "Ever since then my computer locks up for 10 to 30 seconds, mainly for internet related tasks"?
Did you give us a screenshot? Did you mean it freeze when browsing the Internet Explorer?
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Display flicker then lock-up?

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