Lord Sephington

if it was a usb port on the motherboard there is a chance it could have damaged something, but boards now are built pretty well as to stop further damage. but if the pc is working and there are no obvious issues as in random crashing or sudden shutdowns then generally you should be ok. if you are concerned about cpu/gpu issues then run stress tests like AIDA64 and furmark to stress test system to check for instabilities. hope this helps

if the pc is still working it would generally mean you shorted out the usb port, so highly likely the port you used is damaged and can no longer be used

X570/B550 is specifically designed to work straight away with 3rd gen ryzen out of the box. so yes if you buy one it will work straight away so you can take advantage of PCI-E gen 4 and things like that.

if you are using the stock cooler then those temps seems resonable, but if you want lower temps then buying a different cooler will make some difference. i run ryzen 7 2700 with a deepcool gammaxx GT and my cpu idles at 20-25c, i used to use the stock cooler and temp at idle was aroun 5c difference.

what OS are you using? do any lights show when connecting an ethernet cable? also if you can do you have the latest chipset drivers? if you can let me know then can make a guess as to what is wrong.

I personally use a corsair K70 MKII with MX red switches (linear) and i love it as its quiet but every keystroke is registered without issue. i have pudding caps on for more light (as i play alot at night) but generally my opinion is corsair and hyperx are both solid choices to go with for boards that are available. as some more boutique boards either are totally out of stock or are stupidly expensive. i hope this helps a little bit with helping you narrow down choices for you.

My 2 latest purchases, replacing my 2 year old cloud 2 wired headset as im sick to death of running over the cable with my chair all the time, and also upgrading from a slow and aging huawei Y6 2019 to this nokia 5.3 so far it is sooooo much better in every single way compared to the huawei. lockdown has me spending all my money on expensive stuff, but eh as long as it lasts me a while then thats what matters right?

personally i think its a good setup, but please for the love of all that is holy never skimp on power supply, go for something with at least an 80+ rating to ensure some form of hardware safety so the pc isnt a ticking timebomb ready to puff magical blue smoke at any moment and making you have to replace everything when it dies.

Im glad you were able to get sorted in the end, and also that you didnt have to replace ram/motherboard

seems to me like a faulty monitor, as i watched the intel upgrade to linus' group and colton had an issue exactly the same so it seems like it may be time to replace monitor if it keeps happening all the time.

Hardware reserved memory usually points to either faulty ram stick or faulty ram slot on motherboard, i have suffered with this with my own system in the past, i run asus prime b450 plus, ryzen 7 2700 and now 32gb ddr4 2666. when i bought my 1st kit of corsair vengeance ram (2x 8gb sticks) i had this same issue and it turned out to be a DOA ram stick, sent kit back got replacement and everything worked fine after that, my suggestion is to swap ram stick into other slots and see if it helps, if not try booting with just 1 stick in at a time to narrow down if it is a faulty stick or

that config will record gameplay with nvidia shadowplay no issues, the only thing i will say you WILL need more storage as 512gb will fill up stupidly fast with recordings.

with the fans you have being 3pin you wont have any control over them sadly, and as far as i know there isnt any converters/adapters for corsair things. sadly the only way to get fan control is if you specifically buy 4 pin PWM fans they are a little more expensive than 3 pin ones, but places like amazon do good deals of multipacks. i picked up a 5 pack of deepcool RF120 rgb fans for £40 and they are really good and only run at slowest speed of 500rpm

the fan hub you have is for 3pin non PWM controlled fans so all fans connected will always run at full speed. if the other fan hub you have has 4 pin fan headers then it is designed to power manage fans to run at lower speeds. but i think if its corsair it may be used for their own connectors for fans/rgb.

Oh and also you will have to buy a fan splitter of some form due to the motherboard you have chosen only having 1 extra fan connector on it too, so that is also something else to take into consideration.