phone working ok yesterday fully charged but today the phone will not turn on and when I take battery out and back in again it makes 7 bleeps but the phone does not come on at all. I am lost without my phone. Orange said I have to replace the handset has anyone else had the same problem? HELP

 

Orange replaced the handset just now and this 1 also doesnt turn on, I thought it might be a battery problem yesterday but was talked down I really need to know what else I can try I have been without a phone for over 24 hrs now. It is the Desire HD as well I forgot to say..... HELP someone please