help USB Devices not responding before boot

[BOT Joe]

So im building a computer with a bunch of used parts and when i boot it up it i can use my mouse and keyboard in the bios for about 3-5 minutes before both stop responding. (btw this settup is just for me to test a GPU i got from ebay that i wish to use for an actual build but have little time until i can get my money back if it fails) ive tried every single port and multiple devices but they stop responding every time. when i restart theres like a 50/50 chance they work, and when they do work they stop responding faster and faster each time. I also have a flash drive for booting windows plugged in which works perfectly fine and has a light indicating it has power and that is on. I also know that the display is not freezing because i put the system clock up on the bios and it was still running while the devices are not working. when they stop working the screne does seem to stutter once. I probably need to install some drivers or something, maybe the drivers the motherboard loads arent working and it just takes awhile to load until its cached? ive cleared CMOS, legacy usb and stuff is on, the 20 pin looks like a milimeter out of its socket but i cant get it any farther in so probably not that

 

heres the things i think could be the problem (some of these are just random guesses):

-the motherboard is not in a case, i have it sitting on cardboard temporarily lol, some sort of short circuit? 

-im using a water cooler and the radiator does not have a cpu fan (because this is all temporary), but the cpu doesnt even get past 39 degrees C, and i can directly touch the radiator

-the ram i got from my friend is only one stick because the other stick paired with it was dead, maybe this one is gone too

-the psu i got does not give enough power somewhere, it was from ebay but it looks to function really well (this one may be most likely though because if i turn of the power supply for a couple minutes, the time it takes for usb to fail resets)

[[[probably psu which would suck cus i specifically bought it cus i trusted it]]]

 

Specs (yes some of this is garbage):

GPU - LeadTek 3070 WinFast AI blower

CPU - Ryzen 5 1400

RAM - (1 Stick) Corsair Vengeance LPX DDR4 16GB 2400MHz C16

Motherboard - Gigabyte GA-AB350N Mini-ITX

Cooler - Asetek 550LC 120mm liquid cooling (i think)

PSU - EVGA SuperNOVA 750 G2 Modular 750W Power Supply (ive tried both eco boost on and off)

NO CASE

NO SSD/HDD

Using Ghost spectre Windows 10 boot drive

[BOT Joe]

forgot to mention that the psu cable that runs to the outlet is from an older 220W psu, could be faulty but it worked perfectly fine for the older unit, i could have mixed it with a monitor cable that look exactly the same

[UnknownWalls]

13 minutes ago, BOT Joe said:

forgot to mention that the psu cable that runs to the outlet is from an older 220W psu, could be faulty but it worked perfectly fine for the older unit, i could have mixed it with a monitor cable that look exactly the same

Try the other one?

[BOT Joe]

17 hours ago, UnknownWallsTwitch said:

Try the other one?

nah, didnt work. theyre both rated the same anyways

[BOT Joe]

update: tried updating bios because the manufacturer said the newer updates had better usb support and i thought the update worked, but now it doesnt even post…

so i bricked it ig, nothing happened, power stayed on, the bios told me it was successful but nothing happens