Hello,
4 months back, i had purchased an HP ProBook 4540s which worked perfectly but has showed me problems when i need it the most, i had left the laptop switch on for like 2 hours and when i get back to it, it has switched off. I switched it on and it worked perfectly except that it wouldn't charge. When ever i connected the Charger, The charging white light blinked 8 times and didnt charge, i tried removing the battery and switching it on while plugged in but it doesn's switch on, the white light blinks 8 times again. I guess the battery doesnt have any problems since i did the battery check in HP Support Assistant. I have tried the following methods:
"Disconnect AC, Shutdown, Remove battery
Connect AC
Startup (w/o battery)
Open Device Manager
Expand Batteries category & right-click all of the "Microsoft ACPI Compliant Control Method Battery" listings (ok if only 1)
Select Uninstall
Click OK to confirm
Expand System Devices.
Right-click the “ACPI Fixed Features Button" and select Uninstall.
Click OK to confirm
Shutdown, Disconnect AC, Insert battery
Connect AC
Restart the machine"
But i get stuck in step 3 because the laptop doesnt startup without the battery, i've also tried the following
"1-turn off the notebook
2-remove the battery
3-remove the charging adapter
4-Now press and hold the power button for 40 seconds(it will discharge the capacitors)
5-now insert the charging adapter only(dont insert the battery)
6-now press the power button
7-let the windows load and then shutdown it
8-now insert the battery and press the power button"
None of these solutions work, I woud kindly like someone to assist me really fast as i have a school project pending.
By the way my HP ProBook 4540s is running Windows 8.1