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First, you will need to check the voltages of the 2 batteries & make sure they are identical. Both batteries should have identical voltages. The only difference should be that 12-cell batteries last longer than 6-cell batteries.
Next, take the battery off the laptop, & using a dry tooth brush, scrub in between the fins of the battery connector on the motherboard & on the battery it self, then put the battery back into the laptop & try again.
And last, if none of this works, then try updating the BIOS. Sometimes this solves problems with the battery not being detected. You can download the BIOS for your model from Gateway support site. You have to download the BIOS for your exact laptop model. I would also recommend to do some research on the Internet before updating the BIOS to see if somebody else encountered the same problem on the same laptop model, & whether it was solved by flashing the BIOS or not. Beware not to turn the power off while flashing the BIOS, or you might render your laptop unusable.
make sure that all the support drivers for your sound card are all installed. To do this: 1. Right click on your My Computer icon in your desktop 2. Click on Properties 3. Click on the Hardware Tab 4. Click the Device Manager button. 5. Check that there are no yellow question marks in your SOUND DEVICES. If there are, you need to re-install your sound device software
I think your laptop is having some loss contact inside the Motherboard in between power supply or battery. Usually just like this and later on it power up again normally. My advice is you send it to gateway to see your laptop for working it properly. I do it's only a little adjustment on your laptop to them. Good luck!
First test if it works on an external monitor. If it does you will need to clear the CMOS. To clear it:
remove the battery, unplug the cord, and hold the ON button down for 30-60 seconds. Then turn it on. Thats how you clear it on most laptops.
If it does not work on the external monitor, you probally have a bad video card and need to replace the old one
First shine a flashlight on the screen. if you can see a very faint image on the screen the problem is the backlight. If not... it could be a few other problems, first test if it works on an external monitor. If it can then you need to cleear the CMOS. to do this you unplug the cord remove the battery and hold down the ON button for 30-60 seconds, then turn it on. If it does not work on the external monitor it is probally because you have a bad video card and need to replace it.