I am running into a booting issue after installing Ubuntu Server 12.04 LTS. Following is the symptom of the problem. SYSTEM DESCRIPTION: Dual core AMD Athlon 64 3 Disks: two SATA (out of which one is SSD) and one PATA. Using LVM for disk partition management. /boot is not under LVM rest of the partitions are. / is on the SSD BIOS boot sequence is correct and points to the disk with /boot and boot loader is installed on this disk. SYMPTOMS: POST messages Blinking cursor on first line then moves to second line Screen flickers then becomes black Everything is unresponsive, hard reboot POST messages will not show up on screen. Monitor displays powersave message Force shutdown machine again. Shutoff power to machine for a few minutes. Restart machine. POST message show up. Grub menu shows up Ubuntu server 12.04 boots normally. From now on Ubuntu server boots normally until machine is shutdown for a long time (for example, 30 mins) Repeat steps 1 through 13 once the machine is started after a long time. WHAT DID I TRY? I read several posts and have tried: radeon.modeset=0 setting the gfxmode edd=0 nolacpi boot-repair Nothing seems to work. In my search I did see only one post with this same symptom. Unfortunately, I am not being able to locate that post anymore. The interesting fact is that with this same machine configuration, if I install Ubuntu Desktop 12.04 then everything works fine. Any help will be appreciated.