I hear two beeps when i conect power suply on my emachine t5212 model

If you get no power, it sounds like possibly the power supply may be bad. If you can replace the power supply with known working unit, that would be a good start. If at that point you still get no power, then possibly the motherboard could have gone bad. Even without the ram installed you should get power through the board and when you try to boot you should get a beep or series of beeps. I would start with the power supply tho.

Hi, If the computer is hot near the electrical plug in the back of the computer then the power supply needs to be replaced. This will also cause overheating problems if the fan does not exhaust enough air. You should not run the computer in this condition because the power supply can short out and take other components with it. Also there is a risk that it will burn up. Power supplies are very inexpensive and can be changed by anyone with basic computer repair knowledge. Hank

If my sources are correct, (Haven't worked on one in my shop yet), the eMachines T5212 desktop computer uses an Intel D101GGC2 motherboard.

The Intel D101GGC motherboard is Very similar,

http://www.intel.com/support/motherboards/desktop/d101ggc/sb/CS-021718.htm

Motherboard Manual - left-click on English Product Guide [PDF], in blue.

Give a few seconds for the first page to come up, (Took 6 seconds for me), and for the PDF file to fully download, before looking through it. (Took 24 seconds for me)

1) Did you make sure the 24 -pin ATX main power cable, is plugged in tight?
Lock on the side is snapped in place?
Page 42.

Closer look at a 24-pin ATX main power cable, and it's respective connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24


2) Did you plug in the 4-pin ATX +12 Volt power cable?

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Page 42
That's power for the Intel Pentium D model 805 processor.

http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T%20Series&model=T5212

Are the cables (Wires) from the Front Panel of the computer, plugged in correctly into the Front Panel header on the motherboard?
Page 37

Are you sure the DDR2 Sdram ram memory module/s (Stick/s) are plugged in tight?

The best method is to remove it, or them, and reinstall.
This way you are assured.

Most of the time a ram memory module, or more than one, will be bumped loose when installing a Power Supply.

i can try to help you, do you hear the boot beep sound? if you are not able to hear the beep sound then i suggest you to open the machine and check with the cmos battery if it is working or no. if your cmos battery is working then have a check with Power supply. if the power supply working then there might be a problem with your motherboard or cpu. now let me talk about checking the ram. if you are able to remove the ram module remove it and see if u can hear a long beep sound if you are able to hear it try to clean the ram contacts with eraser and then try installing it. i think this might help you

You should be able to find your machine's drivers here:
http://emachines.com/support/product_support.html?cat=Desktops&subcat=T Series&model=T5212

Hi!
Is the power supply the same rating?
Is the HDD spooling up?
Do you hear the post beep?
let me know soon, Thanks

First, Check your ram. If not seated, it will not power up. Also, do you hear a series of beeps or not? Need a better & more exact description of problem and what occurs

try a cheep video card from your local used computer parts store they're every where, you'll ask for a pci video card.

These are called beep codes and there should be a pattern of long and/or short beeps which will repeat. Once you identify the pattern we can help figure this out for you.

There could be a number of causes. Do you hear any beeps when the computer starts up? Try seating all the chips in the motherboard. That means, apply pressure to each individual chip on the motherboard with your finger or thumb. The goal is to make sure each chip is securely attached to the board. Sometimes, heat or new h/w installs partially "pop" some of the chips out of the motherboard - causing the circuitry to be disconnected...