I've read here several times that these phones are not being bricked and that people are overreacting... Well as of this morning, my IP4 is officially bricked. I JB with Limera1n a few days ago and now my phone will not turn on, will not charge, my macbook does not even recoznize the device so I can not restore, fml. Not a great sitUation!!
Nobody has said that an iPhone cannot suffer hardware damage; what we have said is that no software jailbreak can brick your phone. It is entirely possible for certain hardware failures to result in irrecoverable error, as you have discovered. But such hardware failures, however temporally proximate to your jailbreak, are in no way causally linked to it. Your iPhone just broke, and would have done so whether you jailbroke or not.