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E-machine wont power up

In trouble shooting a problem for a friend who said when he powered up the machine it would go to the cmos screen or setup screen and would not go anywhere else.  I get it home and it wont power up at all.  No fan on power supply.   No nothing.  It seems very odd for all the sudden a power supply going bad from his house to mine.  There is no reset or switch on the power supply.  I unplugged the power lead from the supply to the mother board and plugged it back in.  Is there something I can check short of getting a new power supply.
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JAYRU
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JAYRU
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1 Solution
 
Purple_SkyCommented:
Emachines are very well known with their power supply problems. Out of the box emachine system should get its psu replaced.
http://www.consumeraffairs.com/computers/emachine_power.html

Check ebay for emachines power supplies. Stay away from brand bestec.
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ClickCentricCommented:
Purple_Sky has the right idea, but you could also test the power supply.  Do you know what type it is?  You can disconnect it from the motherboard and get it spin up the drives by crossing certain pins depending on the type.  I was just working on a friend's emachine that the same thing happened to, only after trying 2 other power supplies, I found that it wasn't the problem.  Turns out the vga connection on the motherboard had come loose and was shorting when the machine was turned on...worked one time, didn't work the next.  With an E-machine, it just sometimes happens that way.
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rindiCommented:
Check for other things that may have come loose during the transport. Also remove the mainboard from the case and try running it out of it. Maybe something hase caused a short circuit with the case, like a loose screw or something.
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JAYRUAuthor Commented:
Will check all comments and get back this  evening.  Will a known good power supply power up out of the case by itself or does it have to be all hooked up to the board? If it is the power supply can I not replace it with any brand or is it propritary to the emachine?
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rindiCommented:
emachines do often use proprietry power supplies, so it can be difficult to change. You'll have to check the connectors with those of the mainboard to be sure if another PSU works.
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Purple_SkyCommented:
To buy : You will have to find a power supply that will fit in your emachines.

And yes you can just connect the cables from outside to diagnose.

And those power supplies cause motherboard damage at times. Check your motherboard for leaking bulged capasitors.
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CareConnectCommented:
Hi Jayru,
Try those things:
1- If you have a "voltage tester" find out if you have power coming out from the power supply leeds you will get 12V and or 5V DC from it.
2- Swap the memory (yes the memory) i have had that last week same issue no power when pressing the "on" button and i swap the power supply nothing till i swap the ram and it worked.. dont ask why...
3- Some Dell ( i know you dont have a Dell)  you have to hold the power button on for about 5 sec then it will power on.. maybe it has a switch button like that? or a faulty switch as well?
Good luck
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JAYRUAuthor Commented:
To those that said check output with meter.  The Power supply fan is not coming on as stated in the question.  Nothing at all no fan no nothing.  Are you saying that I will get voltage even if the fan on the power supply is not running.  To clearify a question....i asked if a known good powersupply would power up out of the machine.  I meant totally out of the machine on a workbench. Should it power up by just plugging in the power cord or does it have to complete a circuit somehow by being plugged into motherboard and drives as well.
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Purple_SkyCommented:
Main power and 4 pin molex connector ( if any ) should be plugged in to the mother board and you will have to touch to the power switch pins with a paper clip ( some conductor )
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ClickCentricCommented:
I completely missed where you daid the power supply fan isn't coming on.  If it's not coming on at all, not even starting and stopping, the power supply is dead.  It charges up before first discharging to the motherboard and even if the motherboard is killing it, the power supply fan should still have a chance to at least move.  If this isn't happening, the power supply is almost definitely dead.  It's not a given, though.  As the answer to the next question will explain.

As for if a known good power supply will work outsede of the machine, the short answer is yes, but...  You have to cross pins on the main conector to get it to turn 'on'.  The circuit is completed when the power supply is connected to the motherboard, so you need to rig it so it thinks that it is to work.  This can be accomplished just by sticking a piece of wire into the right pin holes on the molex adapter, but it has to be the right pins, which you'd want to check with the power supply manufacturer to verify.  Preferably by diagram so that you can clearly see which pins are needed.  This can be dangerous, though, as you'll be powering up a power supply with open-ended wire and all of the connections open, so be careful if attempting this.  And the reason why it's not a definite that the power supply is dead is that if this circuit on the motherboard fried, the power supply may not even be getting the chance to complete the circuit to come on.

But this is very rare and usually you can see and/or smell this level of electrical damage on the motherboard.
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rindiCommented:
As I said, emachines very often use proprietary PSU's, so you if your uses one like that, you can't just connect another PSU to that mainboard. You need one specifically made for that board. Otherwise it often does make sense to connect the PSU to the mainboard outside the PC's case.
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ClickCentricCommented:
I've never seen one where the connectors to the motherboard were proprietary.  Usually it's just the size and design of the power supply that's unique.  Having custom power connectors on the motherboards would mean a custom motherboard which would actually increase the cost of the system rather than decrease it.  Would seem an unusual move for a bargain pc company.
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rindiCommented:
that's the probelm with emachines, they are often proprietry. It is similar to some Dell's (older ones), and compaqs. If you can build a system in a big quantity, these differences don't make it cost much more. Also you might loose some revenue from the original system, but to keep it going you bind the customers to you and have the spare parts costly. That could in the end be worth the extrra cost for these special boards...
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Purple_SkyCommented:
I dont think emachines have that problem as i never experienced before. Dell's do they are complete instable with different power supplies..
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ClickCentricCommented:
I still haven't seen a non-standard power supply connector on a motherboard in many, many years.  The last one I saw was on a Gateway slimline model and that had to be like 8 years ago.
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