diff --git a/main.c b/main.c
index ac9d9a3..5b931a6 100644
--- a/main.c
+++ b/main.c
@@ -466,6 +466,12 @@ level pulse on the Hot Plug Detect pin. This pulse shall be at least 100 msec.
 		}
 	}
 
+	// verify stored EDID validity
+	if (!edid_length((uint8_t*)EEPROM_ADDR)) {
+		LED_PORT->ODR.reg &= ~LED_PIN; // switch LED on to indicate I²C read fail
+		puts("EEPROM EDID invalid\r\n");
+	}
+
 	bool action = false; // if an action has been performed
 	puts("loop\r\n");
 	while (true) {