Hello and thank you for your question. I look forward to assisting you today. What type of batteries did you use for the replacement?
Okay. From your description, it sounds like the camera will turn on for a few seconds then turns off right away, is that correct?
Do you have the power supply that came with the camera? If so try that and see what happens.
Can you plug that into your computer by chance?
If you can get the camera to power up by way of an AC supply or by plugging it into your computer, then you probably just need to do a little more cleaning around the battery terminals. If not, then there may be more damage then you can resolve on your own and the camera will need to be serviced. Considering the price and age of the camera, you would be better off buying a new camera rather than spending money to repair this one.
How are you doing? Are you able to plug the camera into your computer?