Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Which pins to short to test 24 pin power supply?

VS Omega

New Member
Joined
Apr 15, 2005
Messages
3,213
Reaction score
79
Points
0
Members Ride
VS Commodore Omega
Hey all,

Just a really quick question - I know with the 20 pin ATX PSU's it's the green pin and the black pin shorted to make the PSU start without a motherboard. The PSU I need to test is 20 pin + 4 pin (the 4 pin slides into the module next to the 20 pin so the PSU can be used in older PCs), I tried the normal 2 green pins but it won't switch on - just wanted to be sure the PSU is dead and I'm not just shorting out the wrong pins.

The motherboard LED comes on but the power button wouldn't turn the PC on - I tried shorting the motherboard power switch pins and it didn't work. Before the computer not starting at all it would take a few times pressing the button before it would actually switch on. I calculated that I needed an 800w PSU for my OC'd Quad Core + 4 HDD's so I strongly get the feeling it's the PSU but just wanted to be sure.

Thanks

Bonus question - will running too many components on an underpowered PSU eventually damage it?
 
Joined
Sep 26, 2005
Messages
446
Reaction score
22
Points
18
Location
N.E. Vic
Members Ride
2011 VE SV6 II Commodore - Chlorophyll
I don't short any pins, I went out and bought a PSU tester. It has about 10 LED's which checks the different voltages on different wires. They are fairly cheap if you are testing many PSU's. Recently I have found that in some instances a dead CMOS battery can cause the same effect as having a faulty PSU. Try taking the CMOS battery out of the motherboard and waiting about 20 minutes and then try powering the PC up.

My PSU tester is similiar to this one except black not blue.
eztester2.jpg
 

VS Omega

New Member
Joined
Apr 15, 2005
Messages
3,213
Reaction score
79
Points
0
Members Ride
VS Commodore Omega
I'll do the definitive test to see if it's the PSU - put it in this PC and see what happens. Don't need a tester because I'm not into all that computer stuff any more... thanks for your response anyway
 

tommo82

Non-donating member.
Joined
Mar 9, 2008
Messages
161
Reaction score
17
Points
0
Age
42
Location
Melbourne
Members Ride
2007 HSV Senator
. I calculated that I needed an 800w PSU for my OC'd Quad Core + 4 HDD's so I strongly get the feeling it's the PSU but just wanted to be sure.

How did you calculate it?

800W is alot of power - almost unheard of for a consumer PC (even if overclocked) to consume that.
 

VS Omega

New Member
Joined
Apr 15, 2005
Messages
3,213
Reaction score
79
Points
0
Members Ride
VS Commodore Omega
4 hard drives, 2 dvd burners, 4gb overclocked ram, quad core q6600 pushed to 3.4Ghz, 7+ USB devices, 4 LED fans, TV tuner card, network card, overclocked 7900gs.. it came up to like 783w or something, rounded to 800w to be safe.

If I run the computer at stock speeds it'll sip ~480w.

BTW tested PSU in other box, it's dead so I'll get a new one tomorrow or the day after

Adding to this: In the interest of saving making a new thread how do these nVIDIA 9500's compare to the 7900gs? They're only like $100, if it's better then that'd be awesome, should upgrade.. if not then :(
 
Top