Sony sz340 no power

I have an issue that seems to baffle even sony. The computer stopped working three weeks - I mean it just went black and silent - no power via battery or AC - no lights at all. I sent it in (after fighting with SONY over my extended onsite warranty that they tried hard to deny) and received it back with a BIOs issue resolved. Now it did it again and I am getting the run around again, so after many hours on the phone and getting nowhere want to see if there are any suggestions? I took the battery out, let it sit, held the power button to "release" static - and nothing! Getting green light on two different AC adaptors. Thanks.

 

Fried MoBo!

 

SONY said no - when they sent it back it worked for a week - I agree but I guess they are going to fight me on a replacement.

 

Well - I just talked to the VIP customer service guy again. He told me he couldn't do anything for me - that my extended warranty was with a third party provider. I told him I really didn't care because I bought it directly from sony although I understand what he is saying. He told me to stop calling (I've spoken to him twice). I said "I guess I'm screwed" - He said yes - have a good day. End of call.