In the last couple of months, I've started encountering an error - the
laptop LCD screen is blank upon recovery from Sleep Mode or upon boot. After
rebooting or closing/reopening the lid (or sometimes just waiting a few
minutes does the trick), it starts working and after that works consistently,
it's just the initial "warm up" period from off or sleep state. Any ideas on
how to fix it or troubleshoot it? Would be greatly appreciated!