No bootable device

Bobby_825

Prominent
Jul 6, 2017
3
0
510
so I just took the back of my laptop so i could find where the ram is and what my currently memory capability is because i'm thinking of upgrading it to something better. After i put it back together and started it up it says No Bootable device. The model is Acer Aspire V3-575-72zk if anyone can help me with this that would be great.