I have tried running memtest, it start get about half way then abruptly restarts.

I assume this is not a problem with the OS itself but rather a hardware issue, I have checked various logs when after about 10 reboots it starts ok,

/var/log/kern.log
/var/log/syslog
/var/log/dmesg

All I get is:

EXT4-fs(sdc1): re-mounted. Opts: errors=remount-ro restart

So I ran fcsk on the drive, to check if the fs was failing and it was fine.

Really don't know how to find why the server is continuosly restarting andif I get lucky it will boot up.