Added a workaround. Ramps SD card does not have sdcarddetect. My temporary solution is to add a momentary swtich

that pulls down the SDCARDDETECT pin and mimicking the pull and reinsert ofa a SD card

Marlin/Configuration.h

@@ -179,6 +179,13 @@ const bool Z_ENDSTOPS_INVERTING = false; // set to true to invert the logic of t
 //#define ULTRA_LCD  //general lcd support, also 16x2
 #define SDSUPPORT // Enable SD Card Support in Hardware Console
 
+// Invert the SD card Detect Pin.  
+// If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
+// You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT 
+// in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
+// be commented out otherwise
+#define SDCARDDETECTINVERTED 
+
 #define ULTIPANEL
 #ifdef ULTIPANEL
   #define NEWPANEL  //enable this if you have a click-encoder panel

Marlin/pins.h

@@ -281,8 +281,8 @@
 #ifdef ULTRA_LCD
 
   #ifdef NEWPANEL
-  //arduino pin witch triggers an piezzo beeper
-    #define BEEPER -1			// No Beeper added
+  //arduino pin which triggers an piezzo beeper
+    #define BEEPER 33			// Beeper on AUX-4
 
     #define LCD_PINS_RS 16 
     #define LCD_PINS_ENABLE 17
@@ -300,7 +300,7 @@
     #define BLEN_B 1
     #define BLEN_A 0
     
-    #define SDCARDDETECT -1		// Ramps does not use this port
+    #define SDCARDDETECT 31		// Ramps does not use this port
     
       //encoder rotation values
     #define encrot0 0
@@ -310,7 +310,7 @@
 
   #else //old style panel with shift register
     //arduino pin witch triggers an piezzo beeper
-    #define BEEPER -1		No Beeper added
+    #define BEEPER 33		No Beeper added
 
     //buttons are attached to a shift register
 	// Not wired this yet

Marlin/ultralcd.h

@@ -27,8 +27,15 @@
     
     #define CLICKED (buttons&EN_C)
     #define BLOCK {blocking=millis()+blocktime;}
+
+	#ifdef SDCARDDETECTINVERTED 
+		#define CARDINSERTED (READ(SDCARDDETECT)!=0)
+
+	#else
 		#define CARDINSERTED (READ(SDCARDDETECT)==0)
 
+	#endif  //SDCARDTETECTINVERTED
+
   #else
 
     //atomatic, do not change