External display with lid closed wont work

I have a PB G4 Ti and have connected it to a second display. I have followed the articles on this site but nothing will wake the PB when the lid is still closed. has anyone got any ideas as to why this might be?
Thanks

I'm not sure what the articles say, but here's what I do to make mine work:
1) With the Powerbook shut down, connect the second display
2) Start it up - both displays should be working
3) log in and put the Powerbook to sleep by closing the lid
4) Wake the Powerbook by clicking a mouse that is connected directly to the Powerbook
Hope this helps,
Matt

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