The resource pack may be the issue, try with a few other resource packs and see if they load. if its a server-side issue (as in YOUR downloading the pack)
try this (I used hypixel as an example)
1) First go open minecraft.
2) Delete the Hypixel server.
3) Add it again with the IP "mc.hypixel.net".
4) Change the setting 'server resource pack' from prompt to 'enabled'.
5) Should work.