I tried to hard reset it but the light stopped flashing altogether and my Mac can't see the Time Capsule. Can anyone help?
Ok, few things to sort out.. this is not unusual btw.. the upgrade to ML is never that easy.. and the networking of ML is wet string equivalent.
But I am concerned about the what the front LED flashing means.
What state is the LED now?
When you reboot the TC, describe the sequence of LED flashing you see?
What model TC is it.. the A1xxx model from the rubber foot? How old? What size hard disk in it?
How are you connecting to the TC.. or trying to.. ??
The only way to get connection from a recalcitrant computer to a difficult TC is ethernet. Forget using wireless.
I am using ethernet cable to connect Tc to the Mac.
The LED light was amber before I tried to reset TC. I pressed the reset button and the light disappeared. So no light at the moment.
When I go to System preferences, Time machine, Select backup disk - there is nothing there. The computer can't see the TC.
The TC is wireless, model A1355, 1TB.
No light means dead.. a very bad sign btw..
Unplug the TC and leave it to cool down for a while, say an hour or two. Disconnect the ethernet so there is nothing plugged in at all.
Plug the power back in.. with the mains turned on, and listen for the slight arc as the connection is made..
Look for the front LED and ethernet connectivity leds should all cycle.. if all are dead.. then your TC is dead.
You are suffering shorted caps syndrome of the Gen3..
An increasingly common occurance..
If you have applecare on a computer it might still cover the TC if it is less than 3 years old.. otherwise finding someone to repair is near impossible. You will just need to buy a new one.
If the LED comes on briefly but goes off again after the TC warms up or when you plug in ethernet it is suffering another sort of issue but related.. it might work via wireless but not via ethernet. That can also be fixed.. but I am down under.. and most of the TC repair network I have are not up to board level work.