Firmware help for prusai3

Hi all,
For christmas I was given a Prusa i3 kit (this one: [www.amazon.com])

I was unable to control the extruder form Pronterface, so I updated the firmware to marlin (https://github.com/reprappro/Marlin/tree/master)
Unfortunately, now lots of things don't work, homing for one, and the LED blinks like crazy after I start it up. Pronterface says the bed temp is -26.2, so something in the merlin config probably doesn't match my hardware. I just don't know enough about this stuff to track down the issue.

Has anyone else experienced this? Any chance you have some preconfigured firmware for prusai3/my hardware?



Additional info:
Melzi ardentissimo w/ atmega 1284p, 10k resistors.

config header from failed firmware attempt:

// Uncomment ONE of the next three lines - the one for your RepRap machine
//#define REPRAPPRO_HUXLEY
//#define REPRAPPRO_MENDEL //Legacy Mendel
#define REPRAPPRO_MENDEL2 // Mono Mendel

// Uncomment ONE of the next two lines - the one for your master controller electronics
#define REPRAPPRO_MELZI
//#define REPRAPPRO_SANGUINOLOLU

// Uncomment ONE of the next two lines - the one for the series resistors on your controller
//#define SERIAL_R 4700
#define SERIAL_R 10000



Serial monitor output after connecting to board:

start
echo:Marlin 1.0.2 RRP
echo: Last Updated: 2014-06-02-AB | Author: RRP
echo: Free Memory: 11513 PlannerBufferBytes: 1232
echo:Using Default settings:
echoteps per unit:
echo: M92 X91.429 Y91.429 Z4000.000 E920.000
echo:Maximum feedrates (mm/s):
echo: M203 X300.000 Y300.000 Z3.000 E45.000
echo:Maximum Acceleration (mm/s2):
echo: M201 X800 Y800 Z30 E250
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S1000.000 T1000.000
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum xY jerk (mm/s), Z=maximum Z jerk (mm/s), K=advance_k
echo: M205 S0.000 T0.000 B20000 X15.000 Z0.400 E15.000
echo: M206 X0.000 Y0.000 Z0.000
echo: M208 X210.000 Y210.000 Z140.000
echoID settings:
echo: M301 P12.000 I2.200 D80.000 W125
echo:Thermistor settings: M304 Hh Bb Rr Tt, H0=Bed, H1..n=nozzle, b=thermistor beta value, r=series resistor, t=thermistor resistance as 25C
echo: M304 H0
B3480 R10000 T10000 M304 H1
B3960 R10000 T100000
FPU Enabled no
transform correction not enabledechoD init fail
ok T:21.6 /-273.1 B:-26.2 /-273.1 @:0
k27/7. -6 -7.@0

Don't use the reprap pro version of Marlin - it's specifically configured for their printers. Use this version instead: [github.com].

You will need to set values in configuration.h based on your printer but you'll be off to a good start. Is there any way you can get any information from the vendor with regard to types of thermistor? This will help.