# Pi3 won't boot up (Green light flashes four times) **URL:** \ **Category:** Support\ **Created:** [December 27, 2019, 5:26pm UTC](https://forums.pimoroni.com/t/pi3-wont-boot-up-green-light-flashes-four-times/12540 "2019-12-27T17:26:08Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![DreiAugenFrosch](https://avatars.discourse-cdn.com/v4/letter/d/a6a055/32.png) [@DreiAugenFrosch](https://forums.pimoroni.com/u/DreiAugenFrosch)\ **Post date:** [December 27, 2019, 5:26pm UTC](https://forums.pimoroni.com/t/pi3-wont-boot-up-green-light-flashes-four-times/12540/1 "2019-12-27T17:26:08Z")
Hey there! I got the Picade for Christmas and I set it up. Now I have two problems. First, I had a constant red light, but no green. So the pi didn’t boot up. I bought a new SD card and set it up. This one works fine! So I played with the arcade machine and even restarted it a few times. This morning, when I wanted to turn the pi back on, nothing happened again. Now I have the red light and the green light always flashes four times. I formatted the SD card and reinstalled Retropi. Without success. I even tried the old SD card. Now I have exactly the same problem there. I really have no idea what the problem is or what I could try. Do you have any ideas? ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [December 27, 2019, 9:19pm UTC](https://forums.pimoroni.com/t/pi3-wont-boot-up-green-light-flashes-four-times/12540/2 "2019-12-27T21:19:40Z")
Have a look see here, [https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=58151](https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=58151) I had the 4 green flashes on my Pi 4B and it turned out to be a bad SD Card. [https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=258676](https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=258676)