PC won’t boot up after upgrading PSU

Boomax7299 · January 21, 2022

Howdy all,

I recently decided to upgrade my power supply to accommodate for future upgrades. I picked out the EVGA B5 750 Watt power supply because it was on sale. I finally today got around to replacing it, but for some reason when I hit the power button, nothing happens. Surely I’m just forgetting something or overlooking something, so I’m not panicking just yet.

Here’s what I’ve checked so far:

•24-pin power cable is connected to both the mobo and psu.

•8-Pin CPU cable is plugged in to both the motherboard and PSU (However, one end of it is split into a 4+4 - does it matter what direction this goes in?)

•SATA power is connected to both my front panel and hard drive (hard drive is not my boot drive, my M.2 SSD is)

•The PSU is in fact switched on, and I’ve also tried it with eco mode on and off

•The only thing I haven’t done is use the new power cable that came with the new PSU. I’ve been using the old one. Does that make a difference?

My system specs are a Ryzen 5 3400G, GTX 1650, 16 GB Vengeance LPX Memory, 500 GB M.2 SSD, 2 TB HDD. The PC Model is an ROG Strix GL10DH desktop.

Like I said, odds are I’m just overlooking something but I’d like to rule out other possibilities just in case the PSU was dead on arrival or what. Thanks!

SignatureSigner · January 21, 2022

List of things to try.

I would try a different outlet/the New cable to get the easy things out of the way.

I would triple check your internal connections.

Make sure your front panel headers didn't come lose.

Try a CMOS reset?

I would check to make sure your modular cables are put in the right areas on the PSU

Its possible its DOA and needs returned/replaced.

I believe you can get a PSU to start up if you use a paper clip on one of the cables. (I would try this last if at all)

Boomax7299 · January 21, 2022

10 minutes ago, SignatureSigner said:

List of things to try.

I would try a different outlet/the New cable to get the easy things out of the way.

I would triple check your internal connections.

Make sure your front panel headers didn't come lose.

Try a CMOS reset?

I would check to make sure your modular cables are put in the right areas on the PSU

Its possible its DOA and needs returned/replaced.

I believe you can get a PSU to start up if you use a paper clip on one of the cables. (I would try this last if at all)

You mentioned front panel connectors, which just reminded me - I had previously found that the front panel connector on the power button was a little bit problematic. For some reason it’s soldered to a random piece of PCB in the front of the case (prebuilt stuff I guess), and sometimes the cable for the power button needs to be jiggled a bit to get it to post. I’ve had a couple of scares with the power button before that made me think I killed my PC. So low and behold, I give it a little bit of a jiggle while repeatedly pressing the power button, and it revved right up.

Thank you for your help! Much appreciated.