Power,Volume and camera buttons have all stopped working... and now the phone is off

The title is pretty self explanatory. Noticed when i woke up that neither the power, volume or the camera buttons work. They still clicked when pushed but no function beyond that. The phone its self still worked before i pressed the yellow reset button next to the sim card slot. when i pressed the yellow reset button the phone vibrated and turned off, never to come back on. When i plug it into a charger it still has the LED light except its off so i cant just press the power button to turn it back on. When plugged into the computer, then computer recognises that a device has been plugged in (makes the dun-duh! sound) but the phone is not recognised by either the PC companion or Sony EMMA. Same deal with pulling it into a mac. The Sony mac companion program pops up automatically , it says it does not have any device connected, despite it popping up when i plug my phone in...Ive put adb on my computer and tried adb reboot but again it does not recognise the phone while its off. Is there anything i can do to fix this phone or at least turn it back on? I've spent enough on getting this phone prepared as it is so a DIY fix would be great.any help at all would be much appreciated, thanks

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