Do your servers have any LEDs that light up at all?
Were these completely configured at the factory, or did a reseller add additional equipment to them?
There are a lot of things to check, but having no power at all,, and not even getting any systemboard/bios code level beeps, makes me wonder if they have right power supplies, etc.
I would probably open a ticket with TAC.
Additionally do a sanity check by taking top lid off, and making sure nothing looks like it got bounced around in shipping, etc.