Saieshan Dadi

More details please. Platform ? Amount of old RAM ? Amount of new RAM ? Where is the boot process stopping ? Does the system boot fine with just the old RAM ?

SDRAM is used within the processor With ryzen your biggest consideration should be to get the fastest RAM you can get because it will directly facilitate better performance of infinity fabric. Basically get the fastest DDR4 kit you can get. I'd personally suggest around 3200 CL16 or 300 CL15

I'd wager you're good then

I'd say you could try to flash the bios with one of the psu's that boot. Do it at your own risk though, BIOS are funky and changing things could brick the working setups. I'd suggest having a rollback plan for contingency

As long as it wasn't on I'd gamble that it'd be fine. For your sanctity you could just reinstall your air cooler but I wouldn't think it to be necessary. As you said this was a new setup just make sure there are NO LOOSE SCREWS in the case and in particular underneath the mobo

Even the most experienced of us are human

I don't think you'd see a gaming performance upgrade with windows 10, however you shouldn't see a performance degrade either so upgrading if you can won't be the worst thing to do. The only thing windows 10 explicitly has over 8.1 in the "gaming" department is dx12 which you can't use with a 750Ti and frankly it isn't that ground breaking. I'd say you decide whether you want to upgrade or downgrade based on usability more than anything. OS's don't generally directly affect gaming performance, they affect the back-end things like memory management (which incidentally is quite similar between these 3 OS's) and even if the OS change does affect gaming it is usually negligible. TLDR Don't downgrade unless you prefer using windows 7 over windows 8 Upgrade to windows 10 if you want to but don't expect anything mindblowing

Whether the TIM is good or not isn't the question. It all depends whether it was applied correctly and has enough coverage to sufficiently "Interface" with the processor and dissipate heat generated efficiently.

I idle at around 38 degrees Celsius with a modest single tower air cooler with two 120mm fans so I'd say you don't have much of a problem. Nonetheless maybe re-seat your cooler and double check your TIM application

How much RAM is showing up in bios ?

Not showing up in device manager ?? If windows is using it it should at least show up there

Congrats mate Welcome to the master race

Get whichever mass storage is cheapest. No average user will see any differences between regular mechanical hard drives Other than that it looks like a good build

I would personally go for the Meshify C or the 275r

OS ie operating system. windows