Hi, I recently finished the Great Gate, everything fine, entered, killed, destroyed, closed. After that I continued making the mage guild quests, and at one of them I accidentally killed a guild member.
Now I must do the quest to be accepted again, and I need 20 daedra hearts.

I wanted to enter a oblivion gate, but they all appear rare.

I mean, I see the rocks that normally sorround the gates, and I see a red glow arround it, and at some there are 1 pr 2 oblivion monsters along, but I don't see the gate, i mean, the red "water" like door. And I can't enter.

If I approach I just see the text " a gate to oblivion".


What can I do?

If you have completed the main quest all gates are closed permanently. Too get daedra hearts you must find daedra and conjurer dungeons. There is one east of Leyawind and Fatis Aren's Tomer holds daedra. You can access it from the wizards grotto, where you find the giant slaughterfish.
Edit: http://www.uesp.net/wiki/Oblivion:Dungeons

Thanks alot!

No problem