RE: My Inspiron 5547 laptop doesn't show display after sleep mode
I’d suggest that you follow the steps mentioned below and check for issue resolution.
Switch off the computer.
Disconnect the AC adapter from the system.
Remove the battery from the computer.
Press and hold down the power button for 15 seconds.
Then connect back all the peripherals and check for issue resolution.
In addition, I would suggest you reseat a few components, like memory, hard drive and optical drive and see if that makes a difference. In the link below punch in the system service tag or express service code and you can access the user manual for removing and reseating components.