Phone turned off for most of today, when I turned phone on I responded to text and left on side when I picked up phone an hour later to check email it was as dead as a dodo.

I charged the phone last night so battery was full, but just in case I have plugged it in to charge again to see if that triggered anything, all that happened was that the small red light comes on then a picture of large battery shows on screen with a zigzag showing across it which I assume means it is fully charged.

I have taken battery out for 30 mins then put it back in the hope that would trigger something but no luck.

Any advice on how to get the phone working again would be appreciated.

No, it means it doesnt recognise a battery.
Suggests that it isnt connecting with the battery points in the phone.
check for debris, try and hold it down in the slot and try and turn the phone on.

Thanks for advice, I have just done as suggested but no sign of life. Sounds like I may need a new battery.

Try leaving the battery out for 24 hours. Don't know why, but it seems to fix the battery issue. Also, is there a red light when you insert the battery?

If it's less than a week old will you be able to take it back to the shop/return it where you got it from to get a new one. When I bought my bold the shop said I could come back in two weeks if I was unhappy with it.