Troubleshooting new build

[UberTiger]

Right, trying to trouble shoot a new build.

Got a Gigabyte AMD mobo, when I power on it's getting juice but not posting.

CPU fan is spinning up, graphics card is spinning up but nothing on screen.

I've tried:
1. Different ram.
2. Different ram in different slots.
3. Different graphics card.
4. Different monitor.
5. Different CPU.

All of the parts are new to me but used, only constants I have are I know the monitor works and the extra graphics card I tried works.

24pin power plug is in, 4 pin cpu power is plugged in. The graphics card that needed it had the 6 pin and span up.

Only thing I haven't really tried yet is a different PSU but I've not got one available.

It's the first time I've messed with AMD boards so is there anything obvious I'm missing?

 

[UberTiger]

Just tried a CMOS reset, no luck.
Not sure if grounding could be an issue - currently just got the board sitting on top of the box testbed style (not on an anti-static back or anything )
PSU is a Tagan 750, so not a generic cheapy....hmmm...although I do have a PSU lead tester here somewhere, I should dig that out.

 

[UberTiger]

Hmmm...the first time I've used the power tester, can someone help me interpret?

There's a circle with:

+5
-5
+3.3
-12+
pg
+12
+5vsb

When just the 24 pin mobo power plug is in they are all lit green apart from the -5

There are two additional leds, a +5 and +12

The +12 lights when I also plug in the 4pin cpu power.
The +5 lights if a plug in a molex connector.

Is the -5 rail/connection bust do you think as it didn't light?

 

[UberTiger]

Yeah, I've just tested two other power supplies I have and neither lit the -5, the one in my i7 setup (which I'm not taking out to test on this mobo as the cable management took freakin' ages) and a cheapo 350 generic one I've got which only has a 20 pin power plug so I don't think I can use it to power the AMD mobo, or can I? Although it seems like the tagan is probably working alright anyway and it's another issue...

 

[UberTiger]

Tried it, still gets juice but no post.
I won't have any grounding issues with the board on the box like this will I?