Chunky bit map pattern on screen and will not start up

Please help! My MacBook Pro started doing this thing about a week ago where a chunky bitmap pattern would appear on the screen and the computer would freeze, but you could still see the screen behind the pattern. Somtimes this happens after running awhile. Sometimes it happens right on start up. Sometimes it works fine for a day or two. Now I cannot even get my Mac to start up!! You see blips and lines on the screen the second it lights up. The apple logo appears and you see the spinning wheel, then the screen turns blue and is still full of squares, lines, etc. usually in a diagonal pattern. Something is VERY wrong, but I dont' know what. Since I live in Jamaica, shipping is very expensive and there is no Apple store to bring it to. If the machine is fried and needs repair, how can

Hello!
This would be easier to diagnose if we had more info about your MBP model. There are a number of variants and each may have its own issues.
Do "About this Mac..." from the Apple Menu and then click "More info..." in the resulting window. That launches System Profiler and the first page will identify your specific model. For example; mine looks like this:
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B05
SMC Version: 1.16f10
Serial Number: xxxxxxxxx
Post that info, being sure to delete the serial number like I did. That info will precisely identify which MBP you have and, hopefully lead to assistance.

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Chunky bit map pattern on screen and will not start up

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