Thermistor short, possible fried board, fix?

My printer had been running fine, except for a slow filament leak at the hotend. While attempting to tighten the heater block around the nozzle, one end of the thermistor wire slid out of the not-so-crimped connector. The thermistor then shorted out, and blew.

I changed out the thermistor, and changed the config.h file for the new thermistor type. But I'm still getting this error in pronterface:

Connecting...
start
Printer is now online.
echo: External Reset
Marlin 1.0.0 RC2 _ FoldaRap #000
echo: Last Updated: FoldaRap / 2012-11-01 | Author: EmmanuelG
echo: Free Memory: 13803 PlannerBufferBytes: 1232
echo:Using Default settings:
Error:0
: Extruder switched off. MINTEMP triggered !
Errorrinter stopped deu to errors. Fix the error and use M999 to restart!. (Temperature is reset. Set it before restarting)

I checked the resistance at the end of the wires, it's 102K ohms. Also, since the short, the bed thermistor is now only reading about 3 degrees. I've tried restarting and sending M999, but no change.

So I'm assuming the short fried something on the board? Does anyone know what to look for/how to fix this? Or if there is another possible solution? My board is a Azteeg X1 .
Thanks

Update:

The extruder thermistor actually seems to be working fine, when I disconnect and reconnect, the extruder temperature shows normal temperature for a second or two berfore the error occurs ands turns it to zero. So it's the bed thermistor that's now the problem. Anyone have any suggestions???

i had the same thing happen on my ramps 1.4, i had a cheap chinese arduino, i replaced it with the italian one and it works fine. i would contact the person who sold you the board and maybe have them send you a new one, or see if they can repair it. most likely the pcb is shorted out now, or the chip is bad.

hmm sounds like maybe a short still, see if there are any copper pieces of wire on the board, like the strands from stranded copper wire.

maybe its a contact, those pins etc. can u measure the resistance of the thermister from the pin on the ramps? if cant, see if u can solder 2 probe wires on the board, clip that 2 a meter. turn everything on, monitor that (direct soldered on).

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Thanks for the help. When I measure the pins I see 4.5K on both the bed and extruder. I know that's pretty close to the 4.7K pull up resistors, I don't know what to make of that?

And I checked the back of the board for wire pieces or abnormalities, it looked like there was a lot of debris around the thermistor wires, I cleaned it off, unfortunately no change.

I was wrong, I changed the MINTEMP to zero, just so the printer would stop shutting down, and I could read the temperature signal pronterface was receiving. The extruder is showing 0.3 degrees, and the bed temp is still sitting at 3-5 degrees.

So...thermistor wires outside of terminals are reading fine approx 102K on each. Seeing 4.5K across both the e-trm and b-trm pins with the thermistors plugged in. And approx 4.7k across the pins when they're not.