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RAM is a funny thing Trevor. I have an Asus I purchased from another member here cheap and it had 8GB of on-board RAM. I decided since it had a SODIMM expansion slot I'd buy another 8GB (or 16GB, I can't remember) of RAM. I purchased Kingston RAM, the correct speed for this laptop then found it was NOT recognised, the laptop refused to show anything other than a black screen and my searches showed it required Crucial brand RAM which was well over $130 for the same capacity 8GB Kingston chip I got for $40.
As for upgrades I do my own and have done for over 30 years.
Some laptops can be a real horror to disassemble but I always look for a manual/strip down instructions online (not youtub) especially when it's a friends expensive new thing.
I used to repair mother boards and other associated bits and pieces at a component level back in the days of 386 and 486 computers.
Some batteries are also not as claimed, I purchased a larger battery for my sons old HP Probook when it was still new and regardless of what the seller insisted it did not fit, other replacement batteries have had poor life (same with phone and camera batteries, even things marked with OEM branding).
No, I'm not defending the guy in the shop, I know from experience they will rip you blind or try to......
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