I am using Micromax Yu Yureka. I'm unable to connect with PC using USB connection after recently upgrading my device to Lollipop 5.0.2. But it was working in Kitkat perfectly.
Do you see a notification to select USB type in Android when you connect into PC ? What options are present and which one is selected?– Firelord ♦Jun 9, 2015 at 16:49
go to settings>developers options>and check the USB debugging option.(it should be on).This might help or try hard factory reset.
Please back your claim, why USB debugging needs to be on for a simple USB connection? It seems you understood OP's question about "USB connection" as USB debugging and not data-transfer, which makes this answer useful. However, OP didn't say that, so please fill the details by yourself.– Firelord ♦Jun 9, 2015 at 19:43