If you haven't used your laptop for 1-2 months, your battery needs to recharge, usually overnight.
This depends on how old the battery is? Try taking the battery and hard drive out and turn the machine on, making sure it is plugged in to wall outlet power. This should give you an error. Don't worry it won't hurt anything. Turn off power. Now replace battery and HDD with the laptop still plugged in to power. Turn on and if you get an error post it here. Another test to try is boot to a bootable disc and see how long it runs. If it goes for several minutes or hours you probably have a corrupt file system and need to rebuild system, usually windows has a disc you can download that will help you restore. Good luck!