Absolutely right ! Normally I just unplug all USB devices and SD cards, but last night it still wouldn't boot up and had flashing caps lock. This morning, I just put this laptop (HP 68 CPK Ver. F.06) in my backpack, give some shock by running to catch the bus, then when I would show my problem to my colleague at the office, it works properly without any touch !
However, when I checked mr RAM, it was heavy loaded. What I need to do now is only make a backup for all of my files and clean my temporary files (up to 2Gb) then save some money to buy a future laptop
Maybe next time we can try this solution : unplug then plug the RAM .