Changed hard drive, now screen is messed up

I recently changed out the hard drive on my 15" 2007 Macbook Pro from the factory 5400 RPM, 160GB drive to a Hitachi 7200 RPM, 500GB drive. I carefully followed instructions online on how to open the laptop up, remove and replace the hard drive. When I went to boot up the laptop after the new hard drive was in (with the original OS 10.4 boot disc that came with the computer in the DVD drive) it seemed to load fine at first. I was on the grey load screen for a while, and when it moved to the "Choose your language" screen that appears the first time you turn on your Mac, the screen was a garbled mess. The best way I can describe it is that it looks like an old TV with bad reception from rabbit ear antennae. There are diagonal, blocky black lines across the screen. I can move the mouse cursor fine, and can see that clearly, and if I press enter, it's obvious the computer is working and moves on to the next screen, but it's all behind a garbled mess. Technical support wasn't much help, and only suggested I take it into Mac, but I know they'll charge me to fix it. Any ideas?

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Try doing a Parameter RAM reset - hold down command/option/p/r keys at start up and wait for three chimes before releasing the keys.

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