Hi Not_sure,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP Pavilion dm3 Notebook and not turning on. Here is a link to perform a hard reset. Please note remove any and all USB devices, and remove memory cards from the card reader slot. Disconnect all non-essential devices while troubleshooting. I would also try putting the cord in a different wall outlet no power bars or powerstrips.
Hope this helps.
Thanks.