guys pls help ive been tasked with moving it to a new host for an old sevrer, now running on VMware ESXi. everything looked fine until i powered it on:

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key
No bootable device -- insert boot disk and press any key
The virtual disk is attached and teh right size. The original machine booted fine yesterday. Where did my OS go?
i can see the disk in the VM settings, so its definitely attached lmao the original server is still around, powered off, so i can check settings there if needed. what usually goes wrong when moving an OS like this?? im about to throw this thing out the window lol