I need to know what's wrong with my computer

ever since i moved my hardware to a new case and installed zorin os (no dual boot) my pc has random crashes until i took out all my peripherals except my keyboard and mouse now everytime i plug in more then 2 peripherals the pc randomly shuts down so im only using my keyboard and mouse at the moment it sucks because im on call with friends allot so i need my mic headset and just my speakers on the side

idk if my specs are needed to solve this issue but here they are:
cpu: i7-4790k
gpu: 1050ti
ram: 16gb 1333mhz
mobo: H81M-plus
the psu has around 620 watt so more then enough

Which nvidia driver do you use?
Take a look at Software&Updates > Additional drivers which driver is shown there as in use. Don't use nvidia driver 590 or higher, that can make problems.

Are you running on Wayland or Xorg (X11)? You can check that with

echo $XDG_SESSION_TYPE

Are secure boot and fast boot in your BIOS disabled?

here's what I found for you:

most likely variable here is the move to a new case: high probability of a physical grounding issue.

Check if a small metal tab from the motherboard’s backplate (I/O shield) is accidentally poking into a USB port. If that metal touches the data or power pins inside the port, it will cause an instant shutdown to protect the motherboard.

Also check your motherboard standoffs: Ensure you didn't leave an extra brass standoff in the new case that doesn't have a hole in your motherboard. An extra standoff touching the back of the board can cause "phantom" power draws and instability when the board is under load.

Your motherboard has a feature that shuts the system down if it detects a power surge on the USB rails.

front and rear USB ports connect to the motherboard's circuitry differently.

Since you just moved to a new case, the Front Panel is actually the more likely culprit. the front USB ports are part of the case, not the motherboard. This introduces several potential points of failure:

You had to plug a cable from the case into the pins labeled USB1112 or USB1314 on your motherboard. If those pins are bent or if the connector is offset by one pin, it triggers the Overcurrent Protection immediately.

Case cables are often tucked behind the motherboard tray. If that cable is pinched by a screw or the side panel, the insulation can tear, causing a short against the metal.

some cases have poorly soldered USB PCBs. A single stray solder blob bridging two pins on the front port will cause the "USB Device Overcurrent Status Detected" error.

The rear usb ports on the other hand are soldered directly to the motherboard.

Check if the plastic "tongue" inside the blue (USB 3.0) or black (USB 2.0) ports is snapped. If the pins inside are touching each other, the board won't boot.

How to Isolate the Problem

suggested action:
Unplug the Front Panel: Turn the PC off and completely unplug the USB headers (the wide 20-pin blue one or the 9-pin black ones) from the motherboard.

Test Boot: If the PC boots fine without the front panel connected, the issue is your new case or the cable.

Inspect the Rear: If it still happens with the front panel unplugged, the issue is almost certainly the I/O shield or a stray standoff behind the board.

Also look closely at the USB 3.0 header (the big blue one). The pins are extremely thin. If you plugged it in at an angle when building in the new case, you might have crushed a pin.

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I assume the new case has its own Power Supply Unit, so different to the one in the old case?
Is the new case PSU have sufficient wattage for your hardware? Maybe it is struggling and shutting down when loaded.

EDIT: Just reread your OP and seen this:

OK, but could the new PSU be faulty under load?

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Welcome to the Forum!

Are Secure Boot and Fast Boot in BIOS disabled? Do You have Zorin 18 installed? If, yes, I would suggest to try Zorin 17 because of Your older Hardware. Or installing an older Kernel could be an Option, too.

You have now multiple options but for me it really look like a hardware problem, try to change your power supply like @zabadabadoo said

im not using a new psu im still using the psu i had in my old case and im not sure how to check if its faulty under load

to change my psu id need to wait like 3 weeks until i get my paycheck

i just disabled both and the issue still persists

i have made sure no standoffs/cables are touching the back of tho motherboard and i forgot to put in my i/o shield plus the motherboard is broken when it comes to the front usb ports because there is multiple pins missing but i did have the header plugged in im going to look if the issue persists after i unplug it

edit:
the issue still persists

it doesnt show 590 at all im using 580

it runs on x11 as far as i can see

they are both disabled

And what is with this:

So its the old PSU that worked before in the old case. That rules out faulty new PSU. But the old PSU may have developed a fault. If you have extra components in the new case than you had before. Try removing anything non-essential to see if PSU then works OK with less installed. Also double check wiring and earthing.

yo coincido lo que dice [wsmather] por que yo haria lo siguente quita la torre nueva y regresa a la antigua pero no renuncies a ZORIN es decir trasladalo todo a la antigua torre que tenia y dinos si pasa lo mismo y dudo que la torre nueva tenga algo que toque por ahi algo o algo se habra conectado mal ya que como nosotros no estamos ahi debes ir descartando que Puerto USB te da problemas y mirarlo mas de cerca tanto en la placa PCB base general mirar profundamente si con la torre antigua no pasa obio devuelve la torre nueva y dile que tiene algo que no debe tener y hace un Craseho tu sistema y que te de otra quiza hay algo en los conductos de via usb que conectes a la placa no lo se pero debes pensar por ti , yo haria esto desenchufar todos los USB prendo la maquina y veo que el raton y teclado estan estables bien lo apago de ambos lados ocnecto el primer puerto USB la prendo y meto un USB o una memoria y si esta estable Bien por ti sigue asi hasta dar con el prolema y una vez que encuentres ya sabes que falla.. y podras decidir mejor tu acciones..