It looks that I found the solution to my problem, the first skecth was working correctly because the SD card is using the pin 4 his purpose, so the sketch was working good becuse the SD card was not used here, in the second code where I used th SD card to serve a webpage was not working anymore not because of the code, but becuse the PIN 4 where I connected a led was used by SDcard and so it messed up by blinking the LED

DON'T USE PIN4 WITH AN ETHERNET SHIELD IF YOU PLAN TO USE THE SD CARD

It looks that I found the solution to my problem, the first skecth was working correctly because the SD card is using the pin 4 for his purpose, so the sketch was working good becuse the SD card was not used here, in the second code where I used th SD card to serve a webpage was not working anymore not because of the code, but becuse the PIN 4 where I connected a led was used by SDcard and so it messed up by blinking the LED

DON'T USE PIN4 WITH AN ETHERNET SHIELD IF YOU PLAN TO USE THE SD CARD

It looks that I found the solution to my problem, the first skecth was working correctly because SD card is using the pin 4 his purpose, so the sketch was working good, in the second code where I used th SD card to serve a webpage was not working anymore not because of the code, but becuse the PIN 4 where I connected a led was used by SDcard and so it messed up by blinking the LED

DON'T USE PIN4 WITH NA ETHERNETH SHIELD IF YOU PLAN TO USE THE SD CARD

It looks that I found the solution to my problem, the first skecth was working correctly because the SD card is using the pin 4 his purpose, so the sketch was working good becuse the SD card was not used here, in the second code where I used th SD card to serve a webpage was not working anymore not because of the code, but becuse the PIN 4 where I connected a led was used by SDcard and so it messed up by blinking the LED

DON'T USE PIN4 WITH AN ETHERNET SHIELD IF YOU PLAN TO USE THE SD CARD