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Re: it doesn't work
Try chaning the bios battery to a new one. Then leave it plugged in for a little while and try starting it up. If it still doesn't come on, then it's down to either the motherboard or the processor. If the processor is bad, the motherboard will not power up. Also, check the motherboard to see if there are any signs of swollen capacitors or burnt items on it.
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there is usally a jumper on the mother board that needs to be moved which will clear the cmos if that doesnt work you can try removing the cmos battery aswell as the power from the unit and leave that way for a day or so and then insert the battery and power
I could likely be any of the three items you mentioned.
Are you getting any beeps at all when you start your computer? If not, I would definitely have it looked at by a technician.
A trained technician should test the power supply, then CPU, then motherboard after ensuring fans work properly, CMOS is reset, and components are isolated.
Unplug every thing such as the CD/DVD trays, Hard Drive, take out any dial-up modems, network cards, video cards, etc. unplug even the mouse and keyboard. Try powering on agan. If the computer seems to work, then power back off and plug in one device then power on computer. Keep doing that until you find the bad device preventing the computer from turning on.
If that doesnt work then carefully remove the RAM completely then carefully replace the RAM. Now with on the Dynex power supply plugged in to the motherboard, try again. If still nothing, remove the RAM and try again. If it still does the same thing, then the motherboard is dead and needs replaced. If instead you get a series of beeps then the problem MAY be bad RAM. Try different RAM. If that doesnt help. The only thing left is taking out the CMOS battery, It is the coin shaped battery on the motherboard. Take it out and wait 20 seconds then put it back. I doubt it is the CMOS battery, but at this point it is worth a shot.
Could be either one, or it could be the toggle switch.
Start with the easiest first to check. Unplug the power toggle switch from the mainboard and take a screwdriver or something and short out those two pins to see if it starts the pc. if it does, then your pc case switch is just bad.
If that's not the problem, check the power supply next.
Jumper the ATX 20 pin power cable's green wire to any black, just to make sure the power supply is working. The fans in the power supply will turn on along with anything else hooked up.
To jumper the power supply use a section of wire or a bread twisty (with the insulation removed from the ends) and just connect the green wire to any black wire on the 20 / 24 pin power connector. Make sure that the power switch on the back of the power supply is switched on.
If neither of those seem to be the problem, then most likely it is the motherboard or the processor.
Did you just add the second CD? If you did you may need the driver for the mother board? Make sure the power cord for the cd has voltage plug it into the DVD drive also check the cable make sure red stripe is on the correct side of drive. You can download the driver at http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T-Series&model=T2672
User guide is there as well.
The start button has a pair of wires with a small pin connector on it. This will connect to the motherboard if there is a 3 pin set you might try moving to the other pin. The new power supply also has to provide a start voltage? Your power supply may not be compatible or it may put the voltage on the third pin.