M4-ATX - no power!!

**matfan** · 04-27-2009, 07:25 AM

Ok so I've got 2 m4-atx's that are doing the exact same thing. That is... they are doing nothing!

I've checked and doubled checked the wiring and it all seems fine. all i get in ps_on mode is a blinking led light that flashes once every 5-10 seconds. It appears as though I'm not getting any power on the 12v or 3v rails. Only the 5v!

I've tried using 2 different power sources, 2 psus, 2 main boards and still the same thing!!!

AAAAAAAAGGGGGGGGGHHHHHHHHHHH!!!!!!

Any help would be appreciated.

**ibm_jennifer** · 04-27-2009, 04:28 PM

Why you have bought 2 M4's?

**colin** · 04-27-2009, 04:45 PM

Well since theres a very low chance that you've got 2 DOA boards, have you wired it properly for SURE?

You have the computer's ON switch wired up to the PSU? Do you need a P4 connector too? Are your wires thick enough?

**matfan** · 04-27-2009, 08:28 PM

I have 2 because my dumb-*** mate ordered one for each of us without reading any reviews.

Yeah i've had the on switch wired in and the wires are definitely thick enough. The led light flashes once every 2-3 seconds, 5v and 3v are being supplied to the mainboard but no 12v.

I'll explain my setup

ground - ground
ign - accessories (achieving 12.8v)
b+ - battery (achieving 12.8v)

pins 6+7 (J8) are wired to pc on
dip switch set to P0 (tried P1 as well)

24 pin atx connector hooked up to mainboard
4 pin 12v-atx connector hooked up to mainboard

I can't think of what to do next???

**colin** · 04-27-2009, 10:17 PM

Make sure the computer isn't requiring too much power. Then what I would do is put in a manual switch to power up the computer. Turn on the power supply (or your car if youre testing in-car) and then press the computer's on button. See what happens.

**matfan** · 04-27-2009, 11:22 PM

Originally Posted by colin

Make sure the computer isn't requiring too much power. Then what I would do is put in a manual switch to power up the computer. Turn on the power supply (or your car if youre testing in-car) and then press the computer's on button. See what happens.

Yep I tried that... no power on the 12v rail

**Bugbyte** · 04-28-2009, 12:22 AM

When changing configurations like the jumpers, make sure to disconnect ALL power from the M4 and give it a few seconds before reconnecting.

Also, have you see the "Everything you need to know about your M4 thread?"

**matfan** · 04-28-2009, 01:44 AM

I've read every thread that has the words m4-atx! Still no luck. Another guy on this site had the same problem and never got a resolution so it looks like i'm after a refund!

Can someone who has a m4-atx installed let me know exactly what they did to get it working.

This was supposed to be the easiest part of the install and it's turned into quite the beast.

**Bugbyte** · 04-28-2009, 01:55 PM

My advice is to return them and buy a power supply that works reliably.

**ilyawizard** · 04-28-2009, 04:43 PM

I've got the same set up you have and works good out of the box. Set it on P1 and works perfectly. What kind of PC you have, are you sure it doesn't require more power? My whole system takes about 140W. Not sure how M4-ATX works with more power hungry PCs. Also make sure it is well grounded. And if you have multimeter test all your rails with it when on.

EDIT: Also my mainboard is 20-pin, but I don't see why this would be an issue, or if those 4 pins are defect.