Alienware area 51 Power supply faulty, how to get a replacement? how to upgrade to 1050w?

My alienware Area 51 's power supply was faulty.

The machine died. No reaction after push power button. Technical came and assumed that the power faulty.

So, where can I buy one?

I contact alienware_service@dell.com . They reply me that I can pay 129 DOLLARS to get call back from technical. ARE YOU KIDDING ME? the machine died. What can you do on the phone??????

will you give me free replacement? after 129 paid...

The 129 package also include software balabala something useless.

The power is DPS-850AB-2 A Made in Delta Electronic 850watt

Any suggestion?

Thanks!