GameGear shuts off immediately after power on?

[Zets13]

I opened my GameGear some time back with the intention of replacing the caps but haven't gotten around to ordering them yet so I went ahead and closed it up after a screen cleaning. It used to work fine (save for the almost non-existent sound and perhaps slightly washed-out screen), but now it shuts off immediately after powering on. If I flick it on-off-on rapidly, it seems to stay on. I am running it on batteries.

I've been looking online and see that this is a common problem. Replacing capacitors seems to be an often suggested solution, but I do not think I have seen anyone conclusively say that cap replacement actually resolved their issue.

So, does anyone have an idea what else could cause this so I can order the possibly needed parts along with the caps?
Thanks!

[ApolloBoy]

Regardless if it solves the issue or not, you need to replace the caps.