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Computer Will Not Start


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#1 gcj52

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Posted 03 September 2008 - 09:40 PM

have older desttop emachines computer which was running fine and decided to add more ram. opened computer and took ram out to find out what I had and what I needed (not very wise on working on computers). made sure I touched case after unplugging power supply and opening case. only had to remove right panel to gain access. went to put ram back in and did not get it seated very good think it was backward (told you am dumb about these things) and turned on power and fan in power supply came on, cd-rom would eject from button but no power on light, fan on motherboard would work and would not power up. on-off switch would not turn power supply fan off; only way to turn fan off was to unplug. removed ram and installed right way and same thing happened.

did I burn up system? how to check to see what problem is. Is power supply gone bad; fan in power supply works and cd seems to have power.

thanks in advance for your help, as have some things I need on this computer.

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#2 smurfgod

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Posted 04 September 2008 - 02:10 AM

without a hammer or a saw/cutters of some kind you really can't put it in backwards. Its keyed to only go in one way.
First step would make sure you seated the RAM correctly. Shouldn't be able to see copper, If the clips on the side of the slots go into the grooves on the RAM you're good.
Did the CPU fan work or not work? kinda confused by that one statement.was there any sort of display? only thing that sounds a little odd is the PSU not shutting down.

#3 Romeo29

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Posted 04 September 2008 - 09:55 AM

RAM modules CANNOT be seated in wrong way, they are designed in such a way. The notch in the RAM module has to match!

If the RAM is not seated in the motherboard correctly and BIOS does not detect it, the computer beeps continuosly and boot process does not proceed further.

If the RAM is not seated properly, but BIOS somehow detects it (some pins are making contact), the PC boots but the operating system hangs and shows error.

#4 garmanma

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Posted 04 September 2008 - 10:58 AM

Are you sure you got the correct, compatible memory?
Mark
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why won't my laptop work?

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#5 gcj52

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Posted 04 September 2008 - 11:47 AM

thanks for the quick replys; let me try to clear up my problem. computer was running fine till I took ram out to see what kind and speed needed to add more ram. tried to put back in and it was backward and only inserted part way; turned computer on and would not boot up. removed ram and put in right and is seated with both clips tight.

plug computer back in and only thing working is the power supply fan and and green light on cd will blink for 15 seconds and go out; can open and shut cd as it is getting power. when I plug power cord in power supply fan starts running.

following items do not work

computer will not start only things which appear to be working or getting power are power supply fan and cd player.
cpu fan does not work, but moves a little when unplug unit.
on-off switch will not turn computer on or off and no green light to indicate computer is on. When you unplug power cord you hear a click.

thanks for the help

Edited by gcj52, 04 September 2008 - 11:50 AM.


#6 garmanma

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Posted 04 September 2008 - 12:42 PM

To find the correct memory for your eMachines go to www.crucial.com and use their memory selector tool.
Recheck your plugs and wires to make sure you didnt knock anything loose.
It could just be coincidence and your CPU fan is going bad, maybe bearings. Check to see how clean the heatsink is underneath the fan.
I would also test your power supply:
--------------------------------
Caution: There are electronics inside the case that are very susceptible to electrostatic discharges. To protect your computer, touch the metal of the case to discharge yourself of any electrostatic charges your body may have stored before touching any of the components inside. As a safety precaution you should unplug the computer to avoid electrical shock.
-----------------
The purpose of this procedure is to bypass the motherboard to test the PSU.

Caution:
This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

Posted Image

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.


Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.
---------------------------
At this point you can use a DC Voltage meter to read the different rail Voltages. You will want to insert the black probe into any of the Black (-) sockets, and insert the Red (+) probe in the five different colored sockets, one at a time. Below are the five different colors and their corresponding rail Voltages. The Voltages should be within about ten percent of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC

--------------------------
It should also be noted that older eMachines had the bad habit of frying the motherboard when the power supply went bad

Edited by garmanma, 04 September 2008 - 12:43 PM.

Mark
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why won't my laptop work?

Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits
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