I recently bought a new pi 3 from a merchant on a platform like ebay. It came as a combo with power supply 2.5A, the board itself, heatsinks and the white and red enclosure box. Everything looks fine and original, and the guy had quite a decent reputation so I am assuming (without outlying) that the hardware is fine.
I have though had no success in booting it. I want to install osmc, so I downloaded the latest image, which I have tried to write to microSD with osmc's installer.
I have tried with 3 different 4Gb SD cards and one 16GB one. These are all a few years old, the latter had problems with mounting on linux, but the other 4GB ones I have been able to copy pictures to the HD before flashing it to use for osmc. All these cards have been working fine in a Nikon digital camera, but haven't been used for maybe 2 years now.
The osmc installer completes fine and reports success.
Nevertheless, with all cards, the result has been the same : red LED goes on, but the green flashes **2 times **, not very fast, the first a bit longer than the second. Apart from that, no apparent activity,and the screen (through HDMI) shows nothing.
I must assume that there's a problem with the cards. Nevertheless I am a bit surprised by the issue that out of 4, not one worked.
Next attempt will be to buy a new sd card (8gb),but I wonder if someone can give any other comment on this.