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First of all: locate the reset button. It is probably next to the power plug-in.
Hold down the reset button for at least 30 straight seconds.
Just hold down the reset for 30 seconds, after disconnecting the router from everything except the power.
And then just leave it for a few minutes.
Then hook up an Ethernet cable to one of the common ports.
Then restart your computer, after disconnecting it from wireless and any network cable.
Then when your computer is restarted, hook up the aforementioned Ethernet cable from the repeater (or, once it is properly configured, the repeater).
And see if you can log into its admin setup that way.
Does that work? if not, it might indeed be 'broken' or bricked.