Q: I have an eMac that is at least 5 years old that will not startup. I replaced the backup battery and pressed the reset button and it still does the same thing. After sitting for some time when I try to start it it makes a startup sound but nothing happens

Hello,

Have you done a PRAM reset, CMD+Option+p+r...

http://support.apple.com/kb/HT1379

In fact, do 3 in a row, takes a bit of time.

If you hold Option or alt key at bootup do you get a screen showing boot choices?

Resetting the Logic Board

Resetting the logic board can resolve many system problems. Whenever you have a

unit that fails to power up, you should follow this procedure

before replacing any modules.

1 Unplug the computer.

2 Press the Power On button on the front of the unit.

3 Open the side access panel.

4 Remove the battery from the logic board.

5 Wait at least 10 minutes before replacing the battery.

6 Make sure the battery is installed in the correct +/-

direction.

7 Reassemble the computer and test the unit.

 Cheers, Tom

I also remembered that some model eMacs were plagued with bad capacitors on the logic board and power supply problems. This could be the problem. Do a Google search for more info.

 Cheers, Tom

Here's the range of serial numbers of eMacs with bad capacitor problems to which TMM refers:

• G8412xxxxxx- G8520xxxxxx
• YM412xxxxxx - YM520xxxxxx
• VM440xxxxxx - VM516xxxxxx

How to find the serial number:

http://support.apple.com/kb/HT2395

Yes, but Apple themselves don't work on them, see if you can find an AASP in your  area...

https://locate.apple.com/lac/en/#