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firstly you need to determine if it does have a dedicated graphics card or if the graphics are on-board, as in the case of the latter you cannot change the graphics card and this means it could require a new motherboard or processor (in the case where graphics may be integrated into the processor) or both and even if it does have dedicated graphics card they are not easy to find replacements for, and will require taking the laptop apart, there are places you can send them to be repaired in a lab and this is probably your best option if it is actually broke, if you were hoping to just upgrade your existing card then it is highly unlikely you will find one that fits as even dedicated cards are not universal and specific to the make and model of the laptop itself, in rare cases where upgrade options were available for the laptop when new you may find one with much searching, but as a general rule of thumb if a laptops graphics goes kaput then it is usually time to throw it away and buy a new one, or if this is not an option then sending it away to a lab to have the components replaced is generally the only option, i have in the past found people offering this service on ebay, hope this helps
You will need to update via the Microsoft update setting making sure you tick the box in the optional downloads to get the graphics driver you need after this is done you can then get a higher resolution to make windows 7 display fit the whole screen if this does not happen then you will need to the support website for the Sony vaio
this link here is where you start to get the correct drivers you need for your display if the Microsoft updates didn't fix your graphics problem
The graphics card sounds as if it's dead. If still under guarantee you need to tell best buy to replace the laptop - don't ask them, tell them and refuse to accept a further repair. Do it in writing! Do it today.
Even if it's out of gurantee, if the problem started whilst in guarantee, it will still be covered as it has not been repaired satisfactorily.
The product must be fit for purpose and if it goes seriously wrong within two years it can still be deemed as not fit for purpose entitling you to a full refund.
Personally, I would never buy a sony vaio, but that's just me.
Unfortunatley unlike desktop PC's, laptops do not have swappable graphics cards as they are built into the motherboard
So in essence to replace the graphics card you would be swapping out pretty much all the internals of your laptop i.e. to swap graphic card you will need a new motherboard, if you need a new motherboard then you will need a new CPU etc etc
go to the following website, scroll down and download mobility modder. http://www.driverheaven.net/modtool.php you will also need to download the lates catalyst software from ati don't worry that it isn't for your graphics card because mobility modder will change the files. finally follow all the instructions on the dh modder webpage where you downloaded it from and you can't go wrong. i used to have a sony vaio and i couldn't beleive how sony supports their customers after sale. they haven't and probably never will release a driver for these graphics cards. Shame on Sony!