Sony FS315S won't shutdown/stand by/hibernate...just restarts instead

Hi, I have a strange problem on my laptop. Whenever I try shutdown,
Windows shuts down fine, after the shutting down windows screen it goes
black and a normal computer would turn itself off, however on my laptop
the power indicator remains green (and so does the WLAN if I have the
switch to on) and then about a second or 2 later it boots up again.

The BIOS is up to date but pretty basic, can't change any power
settings like on a desktop, I have turned of all the 'wake on' features
I could find, I don't have Roxio 5 installed, it does this regardless
of battery/mains, and the same happens if I standby or hibernate, it
just turns on again. The laptop powers off fine if I just hold the
power button for a few seconds even though it isn't a proper shutdown
windows style.

If anyone has any ideas that would be great

thanks

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