I connected a external RAID5 device to Dell PowerEdge 2800. (There is a RAID5 of 3 disks on the server.) The windows system started, but it can't find external RAID5. Then I restarted server and entered Ctrl+M and checked configuration of RAID. Then I restarted server and it can't start. The screen showed:

PXE-E61: Media test failure, check cable

PXE-M0f: Exiting inter Boot Agent

I used CD-ROM to start server and couldn't find any disks.

The data is very important on this server. I need help A.S.A.P.

Thank you.