My dear laptop has perished (graphically speaking) help pls:

I own a HP Pavilion hdx9494nr and my graphics card has apparently stopped working all together, is this something I can replace myself and if so is it something I can upgrade?  My warranty was up a few months back so I'm not concerned with voiding anything,  ty for any assistance in advance.

Good advice for almost all laptops, but not yours. That bad boy has a removable nVidia graphics card. It is HP Part No.
454311-001. I do not believe it is upgradeable because it is not a fully standard MXM card but it can be replaced. There is also a replacement heatsink for the video card and while you are at it, you might want to replace it, too.
Here is the Manual.
Manual
The Manual has a full parts list and instructions on disassembly.You can go through HP Partsurfer or just google the parts numbers and you will find vendors. I looked for a minute and could not find a specific price, but do not expect it to be cheap.

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