Removed battery, held power button for about 15 seconds. Put battery back in and pressed power button. 1st boot and got a screen and came here to report. Looks to be caused by trying too many different driver sets causes conflict. Clearing them out brins it back.liquids spills ate kb and inte4rnal mouse equiv so US B hardware kb and mouse and clean boot process worked on mine. Not sure which vendor product next but it will NOT be an HP. That is all.