Monitor shakes. Resolution and drivers ok

[saaroc]

Hello I just built the following PC:

CPU: A10-5800k
Motherboard: Gigabyte GA-F2A88XM-D3H
RAM: G.skill 2x2GB DDR3 1600mhz CL9
Power supply: thermaltake litepower 600w
Monitor: Lg Flatron L1718S

The problem is as follows, the monitor image keeps shaking, I've tried everything, installing various drivers, changing resolution, removing all objects that may interfere and I've tried a live cd of ubuntu in which the image also shakes. The monitor works perfectly when I connect it to a laptop I have and the image is clear, without problems.

I don't know what it could be, sometimes it works fine for half an hour and then suddenly the shaking returns. I think it could be the power supply, but I'm not very sure I say this because when it works well for the first half hour (or 15 min) and then magically goes wrong it's the only explanation I can see.

Can anyone help me???

Thanks

[whoololon]

You can test it on the television, try connecting the PC there if you do not have another monitor.

Where I start to get lost is when you comment that on the laptop it works well, that with a LiveCD you have the same problem, and that the problem appears after a while.
Does it work well when connected to the laptop for more than half an hour?
Does the problem appear from the POST, or after finishing loading the OS?
Is the connector that your laptop uses the same one that you connect to your PC with?

[saaroc]

The connector is VGA, the monitor works well from the laptop for half an hour or more …

Right now, after half an hour of perfect operation, the "dance" has returned, the micro temperature is 40º. I had to check it from the bios, since neither everest nor speedfan give me the correct temperature (they give it in negative, -5º).