I suggest to check your system's BIOS to verify you do not have settings like "wake up on LAN" or "automatic Power up" enabled. Also verify you are using the most recent BIOS version and that it is RHEL 6 compatible.
Thanks for your answer. Checked BIOS but found no obvious root cause.
However, "suspend" seems to have the desired effect , ie powers down , and does not restart of its own accord
You may have a hardware or firmware compatiblity issue, defect or an incompatible peripheral that's causing the issue. You could try removing any installed PCI cards and update your BIOS and firmware to see if it resolves the issue.
Does anyone know how to STOP Oracle Linux 6.4 from restarting itself after a successful shutdown ?
Assuming your network interface is eth0, execute "$ ethtool eth0", like below, and indicate what you get for the lines "Supports Wake-on" and "Wake-on.
lx04:/root $ ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Port: Twisted Pair
Supports Wake-on: pg
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: yes
Then check in your BIOS (usually under APM) for any enabled power-on settings associated with PCI or PCIe bus (your NIC will use one or the other).