|Basically if the machine didn't power down correctly, then removing the battery and holding down the power battery will discharge the memory. Then when you try to reboot again, it should load up normally.|
If the battery isn't charging, then there may be a problem there. Hopefully if you can get it started on mains power, you can isolate the issue and work out whether there is a battery problem or not.
I forgot to ask, what model of Gateway laptop is it?