I turn my car on and the knobs light up for a moment then go off. I only have a black screen please someone tell me what the problem is and how to fix it.

rather than cross-posting, please read the very first sticky in this forum:

http://avic411.com/index.php?/topic/22599-solved-the-formatmbr-sdmlc-and-mapdbinfo-error-0x0000/

It sounds like your boot partition may be corrupted. I fixed an avic f-700bt that was in this condition by reflashing OS

Well I ordered this sd card from eBay I downloaded everything on it then it said to turn off my truck then it would reboot, It turned on and asked for language setting, I set the language and it went to the pioneer logo and now it will just stay on the logo and sometimes go off and back on in a half second right back to the logo. That's all it does PLEASE SOMEONE HELP!!!!!!

hey pionara

got the files but when i do the wince upgrade it gets to 100% read and thats it. I used different wince.bins and cks but no good.

i tested the uboot and it says bad. is there any other way to get into test mode? or any othe way to force the wince upgrade?

Try using the wince6 someone has posted here. I believe its on page 4 of the first stickied thread (the thread that is linked up top on this thread) in service mode try to isntall it again or maybe formating then trykng to install if you are estrmely desperate.