[AC Question]

My phone wouldn't turn on and I need to retrieve the pictures saved on the device memory

[B. Diddy]

Welcome to Android Central! What device? Have you tried replacing the battery? Are you able to hear any sounds from the phone or feel vibrations, but not see anything? That could suggest a broken screen. These are important bits of info that might help figure out if there's a way to retrieve those photos, because if the phone is truly dead (i.e., a failed motherboard), then the photos are lost.