Well, based on what you have told, it looks to me like you are actually running Nemo but you do not have visible UI.

So, to make sure, you need to ssh to the device.

Possibilities:

• What was the Nemo Image release you copied to your mmcblk0p4 partition, it imight be possible you had some development image?
• Maybe there was some problem unpacking the tar file to the partition, and kernel can be loaded OK but for example init is corrupted?