Just wondering if a power refresh would reset the BIOS back to default values? You can only try.
Disconnect charger if connected.
Disconnect main battery
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[guide|36745|Remove or disconnect cmos battery] (you don't state the model number but this may help)
+
[guide|36745|Remove or disconnect cmos battery] (you don't state the model number but this may help) If it is a coin cell battery, rather than a battery with a cable connection, remember the orientation of the battery for when you need to reinstall it, usually it is +ve on top.
Press and hold the laptop power button for 20 seconds then release.
Re-install (reconnect) the cmos battery,
Reconnect the main battery.
Connect and switch on the charger and then turn on the laptop and attempt to enter BIOS by pressing F2.
@johnskinner ,
Just wondering if a power refresh would set the BIOS back to default values? You can only try.
Disconnect charger if connected.
Disconnect main battery
[guide|36745|Remove or disconnect cmos battery] (you don't state the model number but this may help)
Press and hold the laptop power button for 20 seconds then release.
Re-install (reconnect) the cmos battery,
Reconnect the main battery.
Connect and switch on the charger and then turn on the laptop and attempt to enter BIOS by pressing F2.