Htc one s wont turn on!! topic

I rooted my HTC ONE S ( EUROPE ) a couple of months ago, everything was fine until yesterday when I went to unlocked my phone from my lock menu it and it displayed a message on my phone screen saying "hold power button or phone will shut down in 3 seconds" by the time i had realised that that message was there it had one second, so it turned off by itself and it wont come back on, it wont let me into recovery or the bootloader because the screen wont come on!! I've tried volume down and power and it doesnt work, the only thing it displays is a solid orange LED light when i put my phone on charge and my computer doesnt recognise it when i plug it into it? I cant contact my service provider ( o2 ) because i void the warrenty when i rooted. HELP?:(