ok so i'm running out of ideas here.
we have/had 3 managed switches in our server rack and one in a closet; one hp procurve 3500yl 48 port with poe for 2 APs and 2 catalyst 2960s in the bottom of the rack for the proliant blade server and the link to the equallogic datastores.
the one in the closet was another procurve same model i believe.
worked with HPE and came to concur with me that the rack 3500yl is dead (console port intermittent and config commands seemed corrupted/report as invalid)
they next biz day an aruba 3810 and got that setup and cloned a backup of our switch config into it to match the vlans (not a lot just 8 or so plus the default) no special metering or priorities just separating ip pools between departments and building areas.
i can for the life of me not get any of the systems connected to the aruba or the two catalysts to grab a valid dhcp link even though i have a secondary dhcp server up and running on a hardware r230 running server 2012. dns was a vm on the blade server and is running but can only reach the other vms on the blade chassis, switching subnets works between all the vms to get the DC vm to talk to them for at rack RDP but it will not connect to anything outside of the blades even if i set a static ip to what i know is it's valid lease ip (or any other).
i can get to the web management of the new aruba switch from any of the physical systems if i set a static ip in the default vlan range (192.168.100.x) so i know the legs of the network to the aruba is working at least.
any suggestions would be welcome, really scratching my head here not to mention stressing out with this >1yr job and this happens