reboot

[gz]

hi
i purchased an A20-OLinuXino-LIME2-e16Gs16M sbc in March 22
i tested that time and everything looked to work good and put it on the shelve
last month started to work with it again but after a few days it stopped booting.
the forum advise for power issue or bad sd card.
although i bought the board together with the ps of 2A from olimex i replaced it with another of double power but no result
then i bought a new card i tested it with the new image and also with the last one that used to boot successfully in the past but fail again
the board reboots continually
Really don't know what the problem is
please help