hi,my bb bold not working,tryed everything it´s dead,i think is the mainboard ,can someone tell me where i can buy one ,1st hand or 2nd hand ... thanks

Why not just buy another device? Probably easier and probably cheaper in the long run.

I agree with Dubdub. Also, "not working" and "tried everything" are not very descriptive. If you post the actual issue and what you've tried, we may be able to help you fix this.

ok,before to turn it on i would have to put the battery in and out for a few times till it when on after the scroll button didn´t work 100%,and the network as soon as it whent on was ok but after a few seconds nothing,and now doesn´t even turn on,totaly dead...before i wipe it put new software,let it a few days off,dry it ,etc ,etc,etc ...nothing worked.
still if someone knows where i can buy a mainboard maybe in 2nd hand tell me...

thanks.

Dry it? Did you get it wet?
If it's still in warranty, I suggest you contact RIM for a replacement before you disassemble it (which will void any warranty).
If you bought it used, you're probably SOL.

i allready dry it,and i got it used ,what is "SOL"...

If it was used, and still doesn't work, there's no warranty so all repairs or replacement costs are on you.
"SOL" means Shit Out of Luck, a colloquialism for "You are on your own".

Unless you know it's the mainboard bad, you may as well replace the phone. Like Dubdub wrote, that's probably cheaper in the long run.

ok,thanks