I have it on the brightest setting but it's still too dark? I know it gets dark when I unplug it but that's not the case. I have to reboot it to get it bright again. Is it time for a new laptop?
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Why is my laptop screen so dark?
Check the power settings again. It might still be set to dark when unplugged?
There are usually screen brightness settings in the BIOS for unplugged and when on AC power, and also probably under 'Power Options' in Windows control panel. If it goes back to normal after a reboot it is probably one of those.
With not a single clue from you what "laptop" brand, model, how old, what software is running, what happened recently (damage, update, new programs), how to begin to guess?
Continue to reboot.
It'd probably cost you less to replace your laptop than to fix it.