I have tried to install a 256Gb ultra plus in a Dell DX9150 desktop. connecting it on SATA0 in place of the old HDD and then installing Windows XP to it seems to go ok but when a reboot is required there is no boot disk! In case it was an XP issue I installed the latest Ubuntu 14.04 which asked if I wanted to install alongside Windows XP or overwrite. I chose overwrite to insure a clean install. As before the reboot failed at the end of the install. I tried to reinstall 14.04 and it recognised that there was currently a copy on the ssd but even so I did a clean install. Still no luck. I replaced the HDD on SATA0 and put the SSD to SATA1. Enabled SATA1 in setup and rebooted into the old copy of Windows XP. No indication of any drive that could be the SSD. Any suggestions?