I don't see where you allowed the battery to recharge. Do nothing but allow it to recharge, the laptop need not be running. The LED status should offer the condition when fully charged, but give it time. If this is an older laptop and you really left for more than a few mins. when it died, it should have tried to do a safe shutdown or power-OFF. If during that time it got hosed because it couldn't do that, then possible OS corruption or boot config.. I do suggest you give it time before you use it again. After such time is enough, then try a reboot and hope for a normal display, etc.. If not, then you may need to do a "repair" using the Vista restore/recovery discs, not an OS install but repair. It should help rebuild the boot config, etc.. If none of this works, then you may have a bad battery, period. A bad cell will cause improper voltage to be present even if plugged-in, so don't push this you may damage your AC charger. Also, check the manual, you may have a "default reboot switch" located on the laptop or a sequence of keys to push to help in this regard. Visit the Acer support for your model#, it should provide that info. Beware, if you need a new battery, get one from a trusted vendor.
I recently left my computer running on battery and had to leave; when I returned it was off so the battery must have drained.
When I tried to reboot, it displayed the white Acer startup screen (with option to hit F2 to go to setup) - following that the screen goes black, shows a blinking dash in the top left corner a couple of times, then goes completely black.
Computer is an Acer Aspire 9410 running 32-bit Windows Vista.
Any help or suggestions would be greatly appreciated.