Standby Mode uses battery power ...
So if the laptop is left in Standby Mode long enough, eventually the power in the laptop's battery will expire completely.
As with any rechargeable battery, there MUST be a certain percentage of charge present within the battery, before the battery is capable of powering the laptop.
You should connect the AC adapter to the laptop, leaving it SWITCHED OFF, and leave the laptop alone overnight. By the following morning the battery should then have a full charge state and be fully functional again.
As an aside - if you are in your own domestic environment or domiciled in any residential situation, you really should be running the laptop off the AC Mains power pack. It has always been my personal view that the laptop battery only ever came into play whenever I required to power the laptop but did not have access to mains power.
The more times you discharge and recharge the battery pack, the quicker it will eventually die completely.
Any rechargeable battery has a finite number of recharges and that includes batteries for laptop computers. 
Running laptop on AC
I have never seen a laptop with Air Conditioning! 
As for using it while plugged in, if you have it on your lap, there is many a dead laptop out there because of the power cord sticking out and getting hit as you move around.
Lost in translation
If you guys only spoke proper English, how good the world would be.
I have a few questions. Hopefully you can help.
1) My dad just bought a HP laptop (w/XP Pro). We have a Dell printer hooked up to our desktop (also Dell). Is it possible to install the Dell printer drivers on his laptop?
2) I also own a HP laptop (that's 4 years old now). Last Friday, I brought my laptop upstairs and put it on my desk (not plugged in) and it was on Standby. Around 5 minutes later I heard a click that sounded like the battery made a clicking sound (similar to when I take it out of the laptop). The laptop completely shut down at that point. Now my laptop will not even start unless the A/C adapter is plugged in. Did my battery break? Is this a sign that it's used up? Does having the laptop on Standby or Hibernate use up battery power without my knowledge? I tried to contact HP about this and haven't heard back from them. Any help would be greatly appreciated. Thanks! ^_^
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