wake on lan: power on, no boot

[Freddie <freddie_signup@gmx.co.uk>]

Hi Debian users,

I asked this question to the debian-laptop list a few weeks ago but 
there's been no solution found. As I'm not convinced my issues are laptop 
specific I thought I'd open it up to the wider group.

I'm wanting to wake my philips freeline X10 laptop (circa 2004) using wol.

I've enabled power on from PCI in the bios, and I've used ethtool and 
/etc/network/interfaces to ensure that wake on magic packet is enabled for 
eth0 on every boot. I can confirm this with
# ethtool eth0
(the laptop is connect to the router by an ethernet cable).

After powering off the laptop if I send a magic packet using
# wakeonlan -i <ip address> <mac address>
The laptop powers on (that is, the power led turns on and the DVD drive 
spins up a couple of times) but nothing boots. I'm left with a blank 
screen - there're no POST or BIOS screens.

It might also be relevant that a usb peripheral (a sound card, in this 
case) doesn't power on even though it would normally power on at around 
the same time as the DVD drive spinning up during a normal (non-wol) boot.

Does anyone have any ideas what this might be? I'm stumped.

Thanks in advance.

Freddie