Dell Poweredge 2850 can longer see physical drives

I built an older Dell 2850 with Windows 2008r2. I configured it with RAID 5 and a hot spare. All looked good in my home office. When I rebooted the server it would flash 1 logical drive 3 physical drives. I drove it up to a remote office and plugged it in. It would not boot properly and kept trying to boot from the network. I went back into the configuration and see logical drive is still intact. When I go to New Configuration, I see all the drives in READY status, waiting for me to put them online and build another array. If I take a drive out and go back to configuration, the drive no long displays, so I know the server can see the drive. Each time I boot, it now flashes 1 logical drive 0 physical drives. I am lost as to what could have happend to my physical drives. They are light up and display properlty each time I go to configuration. I have tried reseating the RAID controller and have reseated all the drives several times. I am at a loss, all suggestions welcome.