Right side of start up screen is black and graphics flicker.....help!

For the last 2-3 months whenever I turn on my macbook (Mid 2007 white 13in model) the right 3 inches of the screen are black and the log in screen is shifted to the left 1/3 of the screen. These graphics flicker constantly. If I log in my computer stays like that.....black on the right and flickering graphics on the left. I usually have to power off and on around 10 or so times to get it to boot normally. Once it is running normal....it stays like that until I turn it off and back on. When I put it to sleep and back on it never has a problem, only from power off to power on. The screen and graphics are working perfectly except on startup.
Anybody have an idea of what it could be or how to fix it?
I was running snow leopard when this first started. About 1 month ago my HDD crashed so I replaced it and now am running Tiger again as I haven't had time to upgrade the OS yet.

Also- When my computer starts up normally it has a grayish/light blue screen with an apple on it for 2-3 seconds and then the log in screen appears.
However, when it is messed up the screen stays black for 5 seconds and then the log in screen appears distorted on the left side of the screen and the right side stays black.
Both times I hear the initial "ding"

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2009 Macbook Pro, 3.06 GHz Intel 2 core, Max 10.6.8.
Model Name:          MacBook Pro
Model Identifier:          MacBookPro5,2
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          6 MB
Memory:          4 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MBP52.008E.B05
SMC Version (system):          1.42f4
Serial Number (system):          7302300GANE
Hardware UUID:          B2D4B4B4-CD92-5C7A-BDC2-527D30DD8DF3
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EDIT: RESOLVED
For anyone else who finds their way here like I did, this link did it for me: https://forums.geforce.com/default/topic/527599/windows-8-issues-solved-please-r ead-if-you-39-re-having-black-screen-and-or-flickering-/
Specifically, the posts by Dunsany and valkyr did the trick. I booted in safe mode, uninstalled and deleted the Nvidia driver, disabled automatic driver installation, and restarted normally. I then manually downloaded and installed the previous Nvidia driver for my graphics card (which at the time of this writing was 335.23, rather than the latest which was 337.88), and everything is now bueno!
Two hiccoughs along the way: First, when I tried to uninstall the Nvidia driver the first time, when I restarted I got the login screen (which was a good sign), but it quickly went black again. I powered down, restarted in safe mode again, and repeated the uninstallation process, and it worked the second time. Second, when I started the manual install of the 335.23 driver, the computer played a sound similar to the one for disconnecting a USB device, and the screen went black. I'd seen a lot about trying to increase the brightness (though it hadn't worked up to this point; but if you haven't tried it yet, might as well); I tried it, and it worked! So far I'm back up and running. [/fingers crossed]
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Right side of start up screen is black and graphics flicker.....help!

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