What controller do you have installed in your T110 II?   If its a S100 or S300,  it will run Windows only.   You may have corrupted your Windows installation and will need to start over. .    If you want to run linux, you will need to change RAID controllers.   Regards, 
Poweredge t110 ii server , with 4 hard disks controlled using RAID 5 ,OS was windows server 2008 first i used the dell CD and change the OS configuration to windows essential business then CD install some things, at reboot system asked for windows essential cd and it wasn't exist i reboot again but this time from ubuntu cd and install the ubuntu in only one hard disk ( i wasn't know about RAID ) then at reboot system didn't see ubuntu and load windows and ask again for windows essential cd i tried to reboot from dell cd again and install windows server 2008 again but dell cd failed to prepare it this time and ask for missing things i want to know away to remove windows from all disks and instead install linux instead thanks #beginner
RAID 5, windows/ubuntu server 