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Dell Dimension 3000 Won't Power On


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I Fix 4 U's Avatar
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27-Aug-2005, 10:39 PM #1
Dell Dimension 3000 Won't Power On
My friend's dell dimension won't turn on. Pushing the power button does nothing. The computer was working fine recently then there was a power outage around the time. It doesn't seem like the PSU because I had it plugged in with the case open and there was a glowing green light on the motherboard which disappeared upon unplugging the computer.

Now here is exactly what happens when pushing the power button. No fans and/or indicator of being on. Nothing, no harddrive etc.
It really makes me think it is the switch.

How would I go about fixin this.
Bear with me and do try to be quick as the hurricane tomorrow may not allow me to get back on for a week.

Thanx in advance very much
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27-Aug-2005, 10:43 PM #2
If your power supply fan doesn't even turn on, and nothing else does either, I would start to suspect the power supply.
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27-Aug-2005, 10:50 PM #3
Is there a way to reset/check the power supply? That would make sense as if no fans come on then the PSU could be messing up, and although power will still flow (right?) likely there would be failsafes stopping the computer from starting up?
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28-Aug-2005, 12:03 AM #4
See if the "diagnostic lights" at the rear tell you anything:

http://support.dell.com/support/edoc...en&cs=19&s=dhs

I've seen faulty memory issues also cause a similar condition. Try reseating the modules or booting on just one.
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28-Aug-2005, 05:08 AM #5
I think I would agree that if the power supply fan does even start to turn that I would suspect a bad powersupply.
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28-Aug-2005, 08:01 AM #6
Ok, well hurricane isn't here yet.
Can't find the diagnostic lights.
There is no fan movement, but since pushing the power button does nothing, and I can still see the light, how would I figure out if it is the switch or not.
I'll remove a ram stick soon.
On the right track?

*updated*

Last edited by I Fix 4 U; 28-Aug-2005 at 08:50 AM..
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28-Aug-2005, 08:44 AM #7
Quote:
Originally Posted by iXneonXi
Ok, well hurricane isn't here yet.
Can't find the diagnostic lights.
There is no fan, but since pushing the power button does nothing, and I can still see the light, how would I figure out if it is the switch or not.
I'll remove a ram stick soon.
On the right track?
there is NO fan in the psu?? a psu has 3 voltage rails two may still be working while one is screwed, if you want to pull the mobo out of the case, unplug the switch and short the two switch terminals to see if it is the switch, but odds have it on a bad psu.
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Legend:
PSU = power supply unit, CPU = central processing unit
MB = motherboard, NIC = network interface card
OS = operating system, gfx = graphics
GPU = graphics processor, d/l = download, ob = on board
HDD = hard disk drive, FDD = floppy disk drive
HSF = heat sink w/ fan, FSB = front side bus
DM = device manager, KB = Keyboard
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28-Aug-2005, 08:55 AM #8
err bad wording. The fan doesn't move.
OK i get your thing about the voltage rails.
Now since I can't find the diagnostic lights, how may I go about tweaking the switch?
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28-Aug-2005, 09:27 AM #9
Quote:
Originally Posted by iXneonXi
err bad wording. The fan doesn't move.
OK i get your thing about the voltage rails.
Now since I can't find the diagnostic lights, how may I go about tweaking the switch?
I would think that the fan not moving on the psu means its dead, most likely the 12v rail is gone, so you are getting some power to the mobo, etc, but not enough to get through the post, playing with the switch is not going to help. if you still want to try that, there are 2 pins on your mobo where the case switch connects to, if you short those two pins with a flat blade screw driver momentarily, it is the same as if you used the switch. If that doesnt work, then it is not the switch. to get at these two pins you may have to remove the mobo from the case, unplug all the drives leaving just the psu, mobo/cpu+hsf/ram/gfx card combo, no drives, if you do remove the mobo make sure it is on a non conductive surface, cardboard would do, and of course take percautions with static when handling pcb's.

and just a reminder when playing with the case open, unplug the darn thing.
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28-Aug-2005, 10:19 AM #10
Ok well undoing the mobo is out of the question, so I'll see if it is in an accessible spot. Now, doesn't it have to be plugged in to short it? I'd have to get the screwdriver and quickly tap the spot where the switch itself connects to the mobo, thus hopefully making it startup?
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28-Aug-2005, 10:36 AM #11
To do that it has to be plugged in but any other time your fooling around with it, it should be unplugged
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28-Aug-2005, 10:56 AM #12
Makes sense then I have heard some leave it plugged in to ground themselves w/ an antistatic band but that makes no sense. I always unplug.
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28-Aug-2005, 11:20 AM #13
The "diagnostic lights" are 4 leds on the rear panel -- seen as ABCD in this shot.

Normally they are all green (you can't see that here) -- if none of them are lit:

Quote:
The computer is in a normal off condition or a possible pre-BIOS failure has occurred.
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Dell Dimension 3000 Won't Power On-abcddiag.jpg  
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28-Aug-2005, 11:22 AM #14
Oh now I see them, I'll post what they show soon.
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28-Aug-2005, 11:24 AM #15
Lights arent lighting up. Things have quited down @ the house I think I can hear a mild buzz when I put my ear by the computer.
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