sentinel said:
when i shut down my computer it keeps switching back on
Check your system BIOS to be sure you don't have "Wake on Lan" enabled.
When you boot your system, the first screen usually has an instruction on
how to enter setup, instructing you to hit a specific key. When you see
this, hit that key. Then navigate the various screen looking for that
setting. If you have it and it is enabled, disable it, save and exit.
Even if your system is shutdown, packets are often still sent across a
broadband network that might trigger this event.
Another possibility; if you have a feature that allows the system to boot
simply by depressing a key on the keyboard, depending upon sensitivity of
your mouse and keyboard, it can be misinterpreted as having depressed a key
thus causing the system to boot. If your system has such a feature, again,
in the system BIOS, it can usually be disabled as outlined above.