New to Marlin: RAMPS heated bed not working

Just changed over to Marlin (1.1.3) from Repetier on my RAMPS printer as I wanted to try the bed levelling, and can't seem to get the heated bed to power on. The temp reading for the bed works. Bed is plugged in to D8. Don't think it's an electrical issue as if I reflash the board with Repetier the heated bed works fine. Relevant Marlin settings below:-

#define MOTHERBOARD BOARD_RAMPS_14_EFB
#define TEMP_SENSOR_BED 11
//#define PIDTEMPBED
#define BED_LIMIT_SWITCHING
#define MAX_BED_POWER 255

Scratching my head on this one. Any help would be appreciated!

did yo clear the eeprom before uploading marlin. you may have some unwanted data in it

I hadn't but saw it was being ignored due to CRC mismatch. Initialised the EEPROM, reset then retried but heated bed did not come on. So odd as hot-end works fine. Went through the source and definitely defining

#define HEATER_BED_PIN RAMPS_D8_PIN

A day or two after posting, the Arduino died a death and could not be revived. Reflashing a new Arduino and the issue is magically fixed. I suppose about a year isn't bad for a cheap knock-off, but think I'll find a more reputable supplier from now on.