Geeetech

Check the post please, perhaps your crystal oscillator is not soldered well, or there's a poor contact somewhere:
http://www.geeetech.com/forum/viewtopic ... 20&t=17102

Maybe the max temp in firmware is a little low, so when you set the heat temperature at a high value, it will reach the max temp easily and get the error.
#define HEATER_0_MAXTEMP 275
#define HEATER_1_MAXTEMP 275
#define HEATER_2_MAXTEMP 275
#define BED_MAXTEMP 150

Have you clicked "store memory" after you change it?

What's your printer model? The vibration may be because the belt is too loose, or there's something wrong with the wheel or the bearing?

What's the version of arduino do you use, how about using v1.01?

Please check the subdivision of the motor:
http://www.geeetech.com/forum/viewtopic ... 17&t=17038

"the plate is a bowl shape",do you have something to measure it? If it's indeed bent, I think geeetech will replace it for you.

You are right, the LCD you bought is not compatible with your board, so it's necessary to figure out the the version of the LCD, as far as I know, white PCB and blue PCB is campatible with GT2560 board.

Normally LCD 2004 is indeed compatible with GT2560, how do you connect the LCD with your board, can you post a picture?

It's quite normal, the fans will be always on until you power off the printer.