Logon problem - 'pc offline' and password not recognised

Hi

My PC has been in storage for nine months, and I've just dug it out of its box and booted it up with a new keyboard [old one was knackered]. But every time I enter my password, it says 'Your PC is offline. please sign in with the last password used on this PC.' I do so, but it just repeats the message. How can I get back in?

Thanks
David

C'mon peeps. Help! It is my PC, I promise. Been working in Hungary for a while, come back, desperate to be off the laptop, get the desktop setup and can't get in. How do I get past this? All help appreciated.