Hi all,
Merry Christmas to all of you! Best wishes to you and your families!
Now, the question :)

I have Acer 5741G, Compal LA-5891P, Core i3-330, Ati HD5470, 4GB memory. First problem - notebook power on, but no picture, no post. Reball the gpu fix this problem. Now, turn machine on, it works 4-5 minutes and shutdown by itself. It happens in bios, in windows, in dos (hiren's boot). This is what i did:
- check all temperature - they're normal.
- swap memory (on both dimm's separately)
- test with and without HDD - same problem.
- test only on external display - same problem
- remove ODD, usb board, wifi... - same problem....
- heatsink doesn't become hot. Thermal grease and pad has been replaced with new.
I doubt in some capacitors near gpu, which are 0.1uF, 1uF and replace them, but with no result.
Does anybody have this problem?

replace the GPU will solve the problem.

I think that too, but gpu is not cheap, that's the reason I would like to see other opinion.
Thanks, I will wait for some other answers, and I offer gpu replacement.

by reball the gpu, usually the problem is the laptop will turn off by itself,
usually I make the fan always on in maximum speed(but a bit noisy) to solve this problem.

That means gpu overheating? I see temperatures - there are normal..

not means overheating, I also don't understand :) but when fan always on in maximum speed, the laptop works normally.

Hmm, I understand. Waiting for client decision and we will see :)
Thanks again.

Topic can be closed - problem solved after flashing new bios & ec.