Homelab Dell T710 Newbie

Hi all,

This is my first post and would like some help please?

So I have a T710 with 16 drive bays and 32GB ram. This is running ESXi 6.7. I bought this from eBay not long ago for me to learn in a home lab environment. 

It has 12 drives filled up with 600GB HP SAS disks that just worked out the box (well the box from eBay LOL) but I have been given 4x 1TB Seagate Constellation.2 disks and when I put them in the spare disk bays all I get is the power light and no flashing or activity. 

When I reboot the server and go a CTRL-E to get into the raid configurations the new disks aren't even showing up?

I'm totally new to all this so please be gentle. Can you help me get my disks recognised please?

This is the info I have on the disks:

ST91000640SS

FW QF05

SN 9XG6JB6S

Thanks for any time you can spare