Nobody would ask for the brand in reality. For 99% of computer issues it's going to be something specific to the used software or Windows, and if the hardware turned out to be relevant in any way, you'd ask for the model because the brand itself is useless for most issues.
The brand can be a great identifier. If the response is "Apple", I can't help you. If the response is "HP" or "Dell" or "Walmart", I know the issue is likely because of proprietary garbage that's locked down "for the safety of the user".
When speaking to the computer illiterate, the brand question will usually be answered with either "Apple" or "Windows". You gotta get that answer out of the way so you don't waste 15 minutes trying to get someone to right-click something only to find out they only have 1 mouse button.
Of course you ask the brand. With the less tech savvy, you need to be clear and specific in your language. If you ask "is it a macbook?" you'll get confusion as reply. People understand brands though. Even asking if it's Windows might be confusing, because Windows is all they know.
I've bought and repaired quite a few broken pcs over the years, and anytime it's an Alienware that's not starting up it usually means the motherboard has burned out and usually taken the CPU with it.
Mostly because they use the intel stock cooler on an i7 and then make that singular fan also pull double duty as exhaust in an itx sized case, without having heatsinks on any of the vrm or PSU components.
They also overclock all their stuff from factory. Basically, they squeeze out every little drop of performance even at the cost of ruggedness and sanity. Which, to be fair, is what their customers want.
I haven't had anything from the past 5 years from them but nothing I tested was overclocked in any way. The proprietary motherboards didn't even have xmp or multiplier control.
And the gpus are usually the cheapest blower models which aren't capable of sustaining the advertised boost clocks.
Don't think any Alienware pc is ever running near the limits of the hardware, it's just a shitty dell prebuilt covered in cheap plastic and LEDs.