System fails to start after the upgrade process.

C

Coolcat3137
Junior Member

2

02-13-2022, 09:44 AM

#1

I recently upgraded to a 7900 xtx and installed a new PSU to ensure sufficient power. Previously, I used a 750W unit before moving up to a 1000W one. However, after connecting the new PSU, the PC won't boot. When I power on the PSU, the motherboard lights up briefly, then the PC briefly lights up and shuts down when I press the power button, but it restarts when I try again. If I turn off the PSU, let it discharge before re-energizing it—I can attempt to restart the PC once more before it stops responding. Switching back to the old PSU resolves the issue. A video of the problem is attached.

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_Kibbu_
Member

74

02-13-2022, 10:02 AM

#2

Inspect the front-panel header wires. It seems an LED was linked to the reset switch.

T

TotO_Gaming_
Member

59

02-14-2022, 04:39 PM

#3

I've confirmed, it's not that.

S

S0ul_Taker
Junior Member

25

02-21-2022, 07:55 PM

#4

Did you test it with the previous power supply?

A

AwesomeFire
Junior Member

30

02-23-2022, 04:04 PM

#5

Inspect the PSU cables first, since omitting them could lead to the issue.

X

xXAllyBruhXx
Junior Member

12

02-23-2022, 07:18 PM

#6

I've tested both options but didn't see any improvement.

B

beastbb
Junior Member

3

02-27-2022, 06:18 PM

#7

yes

W

Willz_03
Member

179

03-01-2022, 09:27 AM

#8

Old GPU?

F

FireworkFlare
Junior Member

35

03-01-2022, 03:15 PM

#9

I just tried again and still have the same problem.

P

PrincessCute2
Junior Member

38

03-08-2022, 10:16 AM

#10

I faced a comparable problem a few years back after an upgrade went wrong. I accidentally fried my motherboard by linking the fan to both the power and Molex connections. While I’m not sure your PC was damaged, there are steps we can take to troubleshoot. First, try connecting the device directly to the motherboard using a screwdriver, wire, or any conductive material that can bridge the pins. Be careful—incorrect pin connections can harm your system. Refer to the motherboard manual for pin layout on the front panel. Once you’ve tried this, check if the computer responds normally: are the fans spinning? Does the board display error codes? Any of these signs will guide our next actions. If everything looks fine, test the new power supply with hardware you own. If it works under load on another system, it’s likely not the root cause. If not, examine the power connectors closely—look for any signs of damage or debris that might have occurred when replacing the PSU. It could be a short in the back panel or standoff connections. If changing the PSU caused movement, inspect the back panel carefully: make sure the board sits securely with all screws tight and there’s no obstruction. Let me know if these suggestions help, or if you notice anything different when trying them.