New power supply issues

[Guruplant]

So I decided to upgrade my old prebuilt pc. Just adding a graphics card but the psu didn’t have any pci 6+2 connectors so a new psu as well. 

 

I get the parts install everything go to turn it on and nothing. No beeps no lights nothing. 

 

After an hour or 2 of checking connections and as such I decide to check that I’ve not fried something so reinstall the old psu and everything works fine. 

 

I do a paper clip test on the new psu and it works fine. So the psu is not completely dead. So I test a few other things that I can think. 

 

if I connect just the 24 pin connector of the old psu to my motherboard and hit the power button I get fans and a power light. If I do the same thing with the new psu I get nothing. 

 

System specs im dealing with 

 

mother board: msi a68hm grenade

cpu: a10 7870k

new psu: gigabyte p650b

 

is there anything obvious that I’m missing. 

 

Many help would be absolutely amazing. 

 

 

[Jurrunio]

the switch at the back of the new PSU isn't turned on?

[Guruplant]

16 minutes ago, Jurrunio said:

the switch at the back of the new PSU isn't turned on?

If we’re taking about the one next to the power input. Not that obvious

[Ankerson]

There are 2 Power connections on the MB.

 

1x 24 pin and 1x 4 pin

 

Both need to plugged in.

[Guruplant]

I know. When I first set the new psu up I connected all power to everything including HDd, optical drive, fans etc. The only reason I mentioned just plugging in the 24 pin plug is because I found it unusual that the old psu would power on with just that plugged in but the new one doesn’t. 

 

[Guruplant]

So I decided to upgrade my old prebuilt pc. Just adding a graphics card but the psu didn’t have any pci 6+2 connectors so a new psu as well. 

 

I get the parts install everything go to turn it on and nothing. No beeps no lights nothing. 

 

After an hour or 2 of checking connections and as such I decide to check that I’ve not fried something so reinstall the old psu and everything works fine. 

 

I do a paper clip test on the new psu and it works fine. So the psu is not completely dead. So I test a few other things that I can think. 

 

if I connect just the 24 pin connector of the old psu to my motherboard and hit the power button I get fans and a power light. If I do the same thing with the new psu I get nothing. 

 

System specs im dealing with 

 

mother board: msi a68hm grenade

cpu: a10 7870k

new psu: gigabyte p650b

 

is there anything obvious that I’m missing. 

 

Any help would be absolutely amazing. 

[Spotty]

2 hours ago, Guruplant said:

if I connect just the 24 pin connector of the old psu to my motherboard and hit the power button I get fans and a power light. If I do the same thing with the new psu I get nothing.  

As @Ankerson said, you need both the motherboard 24pin and the CPU 4pin power plugged in. The system won't work if only the 24pin is connected. Needs both motherboard and CPU power.
 

Spoiler

 

2 hours ago, Guruplant said:

System specs im dealing with 

Which model PSUs are you using? (Old one and new one)

[Guruplant]

6 hours ago, Spotty said:

As @Ankerson said, you need both the motherboard 24pin and the CPU 4pin power plugged in. The system won't work if only the 24pin is connected. Needs both motherboard and CPU power.
 

  Reveal hidden contents

 

Which model PSUs are you using? (Old one and new one)

Again I do know that and have tried with both in and get nothing. I only tried with the 24 pin connector to test the psu out to see if it would power on at all. 

 

The old old psu is a system builder generic 500w

the new one is a gigabyte p650b

[WkdPaul]

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