Hardware support has nothing to do with your operating system. If your contract for your hardware is good, you'll get hardware support.
Be aware:
If the hardware tech determines you need software assistance for the problem, even though you opened the call as a hardware call, you will be asked for your software contracts. And if your software support is no sufficient for the software you have (i.e. you don't have a special contract for an os that's out of support), you might find yourself having to agree to a special contract before you can get the software support even though you started with hardware.