sleep problem

my macbook has a sleep problem. sometimes when i shut it, it wont sleep. i can tell because the sleep light stays on but doesnt do the brightness change thing. i can hear the optical drive do the thing it does when it comes out of sleep every few second. a weird thing about this is that it only does it when the battery is fully or close to fully charge. and i tried clicking sleep in the menu bar, no luck. i have no idea if the "service battery" photo below has anything to do with this but i posted it just incase

If you're battery has failed/is failing and your Power Saving settings are set to 'never sleep on mains power' that's your issue.

Change your Energy Saving settings and try again

it didn't work, it does it even when its not plugged in sometimes

I that car there must be a process still running. Log into the guest account and see if the behaviour changes

still does it, now even on a low battery

Time to try resetting the the PRAM/SMC