There's so few parts in it, and they are so cheap, why?
First thing would be to swap in a different power supply. Reguarly PC
sized one. If that does it, you know what you need to find. Otherwise,
its a motherboard and a hard drive?
At $40-$50 on eBay for a working one, you'd be hard pressed to "fix"
it for any better. Swap drives and you'll be set again.
The cheapest price on eBay for a Netra X1 is $39.99 and the seller is even
taking best offers:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230189429567
If it's just the power supply you can swap that over.
Then you'll even have spare parts if anything else ever breaks.
Somehow it doesn't look like just the power supply is something that can be
gotten by itself.
Trinean