psu Working PSU not functioning in a working PC

[sproman]

Good day to everyone!

I am experiencing something that i have not seen in my years of computing, and would like some advice if there is any, cause I can't get my head around this problem.

Well I upgraded my PC with a new Power Supply (Corsair RM650i) from a (OCZ Fatal1ty 550W).... I decided to upgrade my cousins PC with my Power supply, so then I can donate a much better Graphics card. Rebuilt the PC using the OCZ power supply and the newer gpu, and the system does not post, I have literary tried everything, PC speaker, replug everything, check every component individualy, starting the PC one less component connected at a time, using the old GPU, different ram, everything. Then I thought I fried the PC, but connecting the old PSU the pc starts up easy, and I tried the OCZ power supply on my main pc where it posted and booted fine. It's kinda like the Motherboard rejects the power supply and does not want to run with it, in my years I have never heard something like that, so I am wondering if there is any magic to get that beast to run?

 

The main specs for that PC is as follows:

CPU - Intel Core 2 Quad Q8300 2.5GHz Quad core

Motherboard - ECS G31T-M7 Revision 7.0

RAM - 3GB DDR2

GPU - AMD Radeon HD5450 1GB (planned upgrade is GTX580)

PSU - Some Generic "Codegen" 400W PSU (planned upgrade is OCZ Fatal1ty 550W)

 

P.S. If there is any more information needed, let me know

Thanks.

[Zando_]

@STRMfrmXMN, this looks like a job for you! 

[ImperialSteele]

How far exactly does your cousin's PC get before it quits? Like do you get fans, a logo on the screen, etc.?

[sproman]

1 minute ago, ImperialSteele said:

How far exactly does your cousin's PC get before it quits? Like do you get fans, a logo on the screen, etc.?

All of the fans start spinning in moderate RPM and it does not POST, the PC speaker gives no beeps whatsoever, screen stays black.

[ImperialSteele]

Have you tried removing the CMOS battery for 30s and reseating it?

[bcguru9384]

22 minutes ago, sproman said:

Good day to everyone!

I am experiencing something that i have not seen in my years of computing, and would like some advice if there is any, cause I can't get my head around this problem.

Well I upgraded my PC with a new Power Supply (Corsair RM650i) from a (OCZ Fatal1ty 550W).... I decided to upgrade my cousins PC with my Power supply, so then I can donate a much better Graphics card. Rebuilt the PC using the OCZ power supply and the newer gpu, and the system does not post, I have literary tried everything, PC speaker, replug everything, check every component individualy, starting the PC one less component connected at a time, using the old GPU, different ram, everything. Then I thought I fried the PC, but connecting the old PSU the pc starts up easy, and I tried the OCZ power supply on my main pc where it posted and booted fine. It's kinda like the Motherboard rejects the power supply and does not want to run with it, in my years I have never heard something like that, so I am wondering if there is any magic to get that beast to run?

 

The main specs for that PC is as follows:

CPU - Intel Core 2 Quad Q8300 2.5GHz Quad core

Motherboard - ECS G31T-M7 Revision 7.0

RAM - 3GB DDR2

GPU - AMD Radeon HD5450 1GB (planned upgrade is GTX580)

PSU - Some Generic "Codegen" 400W PSU (planned upgrade is OCZ Fatal1ty 550W)

 

P.S. If there is any more information needed, let me know

Thanks.

get psu that is only a 20 pin not 20+4 24pin

the pin outs are different by 1 pin function

a return signal to psu for 5vdc load monitoring so mobo send signal but psu no see so no return ACK signal so mobo goes to fail safe mode

[sproman]

I have not, will give it a go.

[sproman]

4 minutes ago, bcguru9384 said:

get psu that is only a 20 pin not 20+4 24pin

the pin outs are different by 1 pin function

a return signal to psu for 5vdc load monitoring so mobo send signal but psu no see so no return ACK signal so mobo goes to fail safe mode

Ah i see, I can see on the OCZ PSU that there is one less cable running in the connector, so the motherboard is not a huge fan of that

[sproman]

14 minutes ago, ImperialSteele said:

Have you tried removing the CMOS battery for 30s and reseating it?

Tried it, sadly nothing new

[sproman]

11 minutes ago, sproman said:

Ah i see, I can see on the OCZ PSU that there is one less cable running in the connector, so the motherboard is not a huge fan of that

But is there a way to trick it, or to add a cable like that, got 5 useless PSU's around, could get my hands dirty tinkering around 

[bcguru9384]

35 minutes ago, sproman said:

But is there a way to trick it, or to add a cable like that, got 5 useless PSU's around, could get my hands dirty tinkering around 

yes and no

yes we can trick but no not best thing as it can provide inaccurate data

otherwise do web image search for 20 pin psu pinout get diagram(i think its pin17 that is different one)

it should be a -5vdc which means sends 5vdc to psu as diagrams all flow from psu to mobo(+#vdc)

you could try to put -5vdc to black wire on the 4pin extra wires(they are ground/return to psu)

but this connection needs a diode and resister to prevent feedback (diode insures proper flow direction resister protects diode overvolt) even may need resister to diode to resister (first resister(closest to mobo)will be highest value as this also creates the path of least resistence flow is to psu)