Never more to buy HP.
This is the second time I say this. This is my second laptop and THE LAST. I was a happy owner HP pavilion with NVIDIA 8400m for last 1 and half year. Until now.
One morning I wake up started started the laptop and after tree to five minutes my screen splits to six and typical artefacts begin to appear.
What more to say. A “new” main board from ebay is around 200$, a repair in service maybe will cost me more – and this is half the price of an new laptop. 
So I open it – first to see main board serial numbers, and it is true no mater what you hear about HP there is BIG problem with overheating inside – cpu and nvidia chips are on the different levels. And if intel cpu touch cpu cooler directly, nvidia gpu is 2 or 3 mm under it, not touching directly the cooler, HP used thermal “gum” compound very poor design of the cooler gives you an series of overheating of the chip and all around components. The north bridge is cooled not with heat sing – it tyres to touch part of the laptop, south bridge only have thermal compound over it – it not touches anything !!! Complete lack of design.
In other words chip unsolder itself.
Solution – to solder it again. First I just heated it for couple of minutes with usual hair dryer . And this WORKED for around 10 minuets. I was able to boot ubuntu and next windows go blue screen, restart and again 6 screens.
So I send it to service to repair – the bad thing is that you never know when will be next maybe final stop.
conclusion : never,never buy HP again, never buy nvidia mobile.
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