Macbook pro a1150 wont boot past kernel, stuck on gray screen.

got a macbook pro a1150 ati 1600 gpu. last for characters in sn are vww. will not boot past gray screen after the gray screen with the apple logo. it has a fresh install of 10.6 on a new hard drive from a laptop of the same exact kind. when in target mode and its Hard Drive used as a boot divice, it will boot. no broken graphic on startup with the apple icon and the pin wheel spinning. boots to safe mode just fine, will even do updates. but will not boot from the NEW hard drive or the dvd rom. when i put the old hard drive in with 10.5 it wont boot past the blue screen and the same with the 10.5 install disc i baught. reset pram, changed ram, removed wifi card and even tried disconnecting the dvd rom but still will not go to the login screen. even disabled auto login (when it was in target mode). do i reflow the gpu? is it a gpu problem? one thing strange.... in safe mode, lines show up on the mouse icon and just that. the rest of the screen shows everything fine, i've seen this before with the nvidia chipset but not with ati. how do i fix it?

to better explain... the macbook pro in question never get to the blue startup screen which happenes before the login menu. not though dvd rom, hard drive, external dvd rom or external hard drive. just stop there. i hear the hard drive working / dvd spinning and the computer reading the disc but after a few min of just seeing the grey screen both would spin down.

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Run the Startup Manager to select Startup disk: http://support.apple.com/kb/HT1310
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Hi,
I need a help regarding issues with my macbook pro. I am getting bluescreen on start up. Here is a link: https://www.youtube.com/watch?v=lzryrh5x-Rs
I did new reinstall of mountain lion but it was working for about 10min, after I did first update, I did restart but it just stopped at grey screen.
I went also to apple shop, they did tests and said that all HW tests are ok and it should be something software related.
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Tnx
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Hold on to your hat . . . .
The issue was the battery. These guys have a Lithium battery that allows them to boot up, a battery that can be purchased anywhere that sells those kinds of thing. I bought 2 for $3.50, it was more time and trouble to get into the case and get at the logic board but once the battery was replaced everything works like a dream.
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Macbook pro a1150 wont boot past kernel, stuck on gray screen.

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