Hi Edwin,
The BIOS uses a standard CR2032 battery to keep configs/time etc.[br]
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If this battery is dead your laptop would still start-up albeit with errors which you can skip or address to continue to boot up into the OS.[br]
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I’ve seen the white screen issue before and most of the time got it working again by just removing all power sources to the motherboard for a couple of minutes, i.e. remove main power, remove main battery and then BIOS battery, keep everything plugged out for a couple of minutes, insert BIOS battery and then without the main battery just plug in the main power source and see if it will power on or not.[br]
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Hope this helps, lemme know.[br]
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