Laptop, LCD not working, VGA works, artifacts

[AndreyS]

My laptop now works only with external monitor and only in safe mode.

What was happening:
1) HP dv7-4045er laptop is great laptop but with awful cooling system design. I had to often (once per month) clear the heatsink. But I wasn't able to keep it always up.
2) Sometimes I could see some wrong textures in some games. It happened not really often (rare I'd say).
3) I haven't turned the laptop off for about 35 days. But I kept the load low, so that laptop's fan was quite.
4) Last time when I had to move, I hibernated the laptop. When I woke it up, LCD backlight turned on, but LCD showed all black. I waited for few (3-5) minutes and turned it off (I don't remember how long I held power button).
5) I unplug power cable, and plug it in. Then I turned the laptop on. This time LCD backlight didn't work. LCD didn't show anything.

After all that happened I connected external monitor, windows 7 wasn't able to boot up successfully (it crashed on loading screen. On loading video drivers maybe?). I was able to boot up in safe mode. But there some visible artifacts on the screen.
you can see horizontal blue'ish strips
Artifacts (as random black dots) was present in bios as well.

My question is: Is that really a fault of GPU/video memory or LCD connection?
The outcome of the answer affects whether I:
1) go to repair center, and get unreliable reballing or if I have a luck brand new GPU or
2) buy the whole motherboard from China (they state that mb is fully tested and 100% working)

PS: I think that GPU is the cause, and I am more inclined to buy the mb. But I'm alone with my mind at the moment, unconfident.

[singapol]

If it only boots up in safe mode it means windows has problems.You can boot up using debug mode  why it runs ilne by line instructions and it will stop once it encounters the problem driver.If it's the  video driver only you will know. If it is hardware problem then don't waste time repairing you will not like it afterv it is repaired and since this was introduced in 2010 it's time for a new laptop.

[AndreyS]

it's time for a new laptop.

I'd like to get a new laptop, but unfortunately I can't afford nice one at the moment. And the crappy laptop, I don't want it.

Want to add, CPU doesn't have integrated GPU circuitry, and I had rarely this:

And my PC froze when I tried to hibernate it while flashplayer plugin was in the RAM (with any browser).

I ran debug mode, and it is indeed caused by ati driver atikmpag.sys:
Dots are nicely visible here.

Thank you man, I might definitely go for new mb.

[wraper]

Most likely either GPU or VRAM is faulty.