This is a followup to my article, 5 Helpful AE-CLOUD1 Setup Tips.
If you see three blinking LEDs, please check your log files on the board. Mount the board as a flash drive and look at network.log.
This indicates that you either do not have the WiFi PMOD module inserted properly or the jumper is not set to 3v.
Check your wifi.txt that should contain the SSID on line 1 and the password on line 2.
Other things to check
If this still does not solve your problem, please refer to my article on restoring the factory image on the AE-CLOUD1 board.
The AE-CLOUD1 kit is available for purchase on SeeedStudio