Dell 2350 no power, green light

April 5, 2009 at 11:06:12
Specs: Windows XP

When i attempt to turn on my computer, NOTHING is just dead. I opened up the computer case and attempted to turn it on again with the case open, and again nothing happens, but I notice the light on the motherboard turns on when I plug in the cord to the computer. The light is green and it does not flash (stays a solid green). The light is triggered when I plug in the computer (not when I press the front power button).

But this light is the only sign of life from this computer. Anyone have any ideas on what this could be?? I thought it could be the powersupply...but I don't want to spend the money on a replacement until I'm sure.

Also, I looked for any flashing lights (diagnostic codes) on the back of my computer...and there are none.

Thanks for any help.

See More: Dell 2350 no power, green light

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April 5, 2009 at 15:00:36
Does the fan on the MB or in the PSU run? That would tell us if it were a voltage issue.

John W. Borelli
IT Specialist

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April 5, 2009 at 15:15:05
No, it's not running. Not a peep.

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April 5, 2009 at 20:50:47
Dell Dimension 2350
Advanced Troubleshooting

Diagnostic codes

If there is a switch on the power supply itself, are you sure it's in the ON position?

If you are getting no diagnostic leds lighting up at all, the most likely thing is your power supply is failing and just about dead.

Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:

If you can temporaily borrow a known working power supply to try with your computer, try that with your computer before buying a new power supply.
The Dimension 2400 series has a known problem with power supplies that fail more often than average, and when they do fail completely they are more likely than average to have damaged something else, often the mboard - the same may apply to your model series.

In most cases you can replace the power supply with any standard ATX of the standard size.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:

The led on the mboard is there to remind you that the ATX mboard is always powered in some places even when the computer is not running as long as the PS is receiving live AC, and you must disconnect the AC power whenever you make any changes to connections or components inside the case, otherwise you can damage something. It lighting up doesn't necessarily indicate the power supply is working properly, since the power supply must supply three major voltages - +3.3, +5, and +12v - and three minor ones - -5v, -12v, and +5vsb - and the led needs only one of those.

Other causes.

If you have changed which ram you have installed, not all ram is compatible with your mboard. In the worst cases of ram incompatibilty, your mboard WILL NOT BOOT when the problem ram is installed and often the mboard WILL NOT BEEP - the mboard appears to be dead.

If you still have the ram that was installed before when the mboard was working fine, install just that ram.

If you don't...

Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.

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Related Solutions

April 5, 2009 at 21:00:53
thanks so much for your thorough reply!
I haven't added any new ram lately, so I doubt that's the problem. I don't have a spare power supply I can test it out with. So I think I'm going to just wing it and buy one and hope thats what the problem is. thanks again. Ill let you know how it turned out.

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April 10, 2009 at 17:43:16
so I bought a new power supply....installed it, and still nothing.
I don't know what it could be at this point. could it be the motherboard? I thought that even if the motherboard is damaged the cd drive would still go in and out??(which it's not doing) this true?

Any help would be great, thanks.

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April 10, 2009 at 22:43:28
Did you remember to plug in the 4 "pin" 12v power connector into the mboard?

If there is a switch on the power supply itself, are you sure it's in the ON position?

Make sure the recessed slide switch on the back of the power supply is set to the proper voltage - it's often red - it should be all the way to one side or the other.

If you're in Europe or the UK, some cords to the power supply have a fuse or fuses in it, probably at the plug end - make sure it's/they are not blown.

Diagnostic codes

Are you getting something besides no leds lighting up at all?

You may have a poor connection inside your case somewhere.

Unplug the case/power supply.
Power off your monitor.
Open up the case by removing the left panel as seen when you're looking at the front of the case.
Check all the connections of the wiring to make sure they are all the way onto their pins and into their sockets, especially the main connector from the power supply. The wires close to the mboard going into the main power connector/socket should be more or less perpendicular to the mboard surface rather than at an angle. Make sure all cards in slots are all the way down in their slots.

Some Dell cases have a latch you must push one way rather than screws you must remove at the back of the case.


While you're in there, if the cpu fan/heatsink has mung (dust, lint, etc.) on it, clean it off, but DO NOT use a vaccuum cleaner to do that (they produce a tremendous amount of static electricity when running, and anything connected to them can discharge that to your components) - use canned air, or an air nozzle if you have access to an air compressor, or an artist's brush that can be used in small spaces, etc. It may be difficult to clean the top of the heatsink under the cpu fan - the most likely place to have mung on it - and the bottom side of the cpu fan blades unless you remove the fan. If you have a case fan, clean that too if it needs it.

See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:

"could it be the motherboard?"

If it's the same situation as with the Dimension 2400 series the original power supply may have damaged the mboard while failing. Other than that cause, it's quite rare for mboards to die.

"I thought that even if the motherboard is damaged the cd drive would still go in and out??(which it's not doing) this true?"

All computer power supplies are switching power supplies.
They're not like a power transformer. What becomes +12v when it's rectified (turned from AC to DC) is made by rapidly switching the 115v or 230v AC input on and off rapidly - there is no transformer inside the power supply for +12v, but there are small transformers for +5v and +3.3v . An IC chip inside the power supply determines whether it goes fully on or not, and one of the 20 wires in the main power connector on the mboard carries a "power good" signal that is generated by the mboard when you press the power button IF the mboard is working okay. If the mboard doesn't generate the "power good" signal, the power supply cannot turn on fully.
There is no +12v and +5v going to the power connectors to the drives if the power supply cannot turn on fully (hard drives and optical drives require both voltages on a desktop computer. A floppy drive only requires +5v.)

Also, the power supply must have at least a minimal load on it or it won't turn on.

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