Press the power button for 7 secs, it beeps twice, use option 4 then 5 and then boot , you need to reset your ps4 settings bit it seems to have cured the rest mode issues for me... Well it worked twice on the trot after that before it would just flash an Amber light and the ps4 was still actually on and ps button wouldn't turn it on at all in fact I to hard reset when it happened.
Nope, after I just typed all that in, it's still broken in rest mode, no new hdd, stock system, borked rest mode, like many others are reporting across the net.. so no more suspend for me it seems , clearly a bug in the firmware