Computer gets to hot to touch but fans are working OK

My macbkpro17 is 5 years old and a few months ago I replaced the hard drive. Recently the display on scrolling gives distorted images as well as the bar code effect. It freezes a lot and gets very hot. CPU reaches 80c but fans seem to be working. case gets hot. have run tests and it comes up with no faults detected.
Any ideas please.

If yours is the "Late 2007" (MacBookPro3,1 in System Profiler) or the "Early 2008" (MacBookPro4,1) your video issues could be due to a known defect---not heat---for which there is a no-cost repair program. See this Apple article:
http://support.apple.com/kb/TS2377
For final diagnosis that determines if you get the free logic board replacement, you must take the computer to an Apple Store or AASP so they can run a specific test you cannot do at home. If it fails their test, you get a new logic board.
The one sticking point is the replaced hard drive. If it's obvious to them that the HD is not the original and you cannot show evidence (work order or receipt) taht an approved shop did the work, they could refuse to work on it.

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