Macbook  flickering screen & freeze, then won't boot pass the apple logo

Hi Guys,
My macbook is driving me insane now. Just recently, my macbook has occasionally flickering screen and freezes after that. Yesterday, when I was watching youtube on fullscreen, it first has flickering screen, then freezes. So I hard booted it pressing the power button. Then, when I try to restart it, it won't boot pass the apple logo no matter what.
Here's my macbook spec
2007 Summer Macbook Pro 15"
Snow Leopard 10.6 OS X
I cracked my screen once, and got a replacement, don't know if that matters.
I've tried the following:
Safe mood reboot, the progress bar goes about half, then disappears and stalls again.
Booted in verbose mode but it gives a warning message:
'com.apple.driver. internalmodemsupport declares no kernel dependencies; using com.apple.kernal.6.0'.
Booted in Single user mood, and typed fsck for disk repair. After checking said the volume Macintosh HD appears to be ok. But still won't boot pass the apple logo after restart.
Boot with installation disk pressing C at startup. Success after a few try:
Opened Disk Utility and did disk repair (no problem found).
Reinstalled Snow Leopard OS X 10.6.
This time it booted with Finder and everything for a short while, then the screen flicker and freezes again (before I can backup anything!). Then, I can't reboot pass the apple logo again.
When I try to reinstall Leopard OS X 10.5 with installation disk, the macbook seems to try to read the disk, but won't boot. I've got a CD stuck in the optical drive now.
I've tried everything I can find online short of opening it up and send it into the oven for baking! I pray it's not a hardware problem, coz I'm no good at that. (QAQ~~~) Please help me!
Thank you very, very, very much!!!
ps. this is my first post. please let me know if I have missed anything.

starangelam wrote:
When I try to reinstall Leopard OS X 10.5 with installation disk, the macbook seems to try to read the disk, but won't boot. I've got a CD stuck in the optical drive now.
Reboot the machine holding the trackpad or left wired mouse button down, that shoudl force eject the 10.5 disk.
Reinstalled Snow Leopard OS X 10.6.
This time it booted with Finder and everything for a short while, then the screen flicker and freezes again (before I can backup anything!). Then, I can't reboot pass the apple logo again.
Ok, so your attempting data recovery efforts.
First get the 10.5 disk out of the machine, like above.
You can also boot into Single User mode, (command s at reboot) and enter
/usr/bin/drutil eject
then type
restart
Next hold c boot and use the 10.6 disk and create a data recovery drive here on a blank external drive, make sure you clean and polish the bottom of the 10.6 disk, if it's bad you will need to get a new one.
Create a data recovery, undelete boot drive
If your problems continue on this drive even with a clean or new 10.6 disk, it's likely a hardware issue with your Mac, not a issue with the drive.
I suspect a failing sector on your internal boot drive, you installed OS X right over the same spot perhaps, as you were obviously able to boot from the 10.6 disk to install it so it seems the hardware of the Mac appears to be working.
You might have other issues relateing to software perhaps, something your installing or running.
Step by Step to fix your Mac
Once you have gotten your files off the internal drive, you may want to look into doing a Zero Erase with Disk Utility before resintalling 10.6 again fresh install method.
Reducing bad sectors effect on hard drives
How to erase and install Snow Leopard 10.6
Look into making a bootable clone, it's easier to restore with and more options than Timemachine
Most commonly used backup methods explained

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