Try leaving your phone on power supply for extended period of time (several hours), then try switching it on. If not working, try holding VolumeDown+Power button for like half a minute. If nothing happens, I'm afraid I've got bad news for you.Having the same issue. Im not on CM11 but on Candyrom (!). Installed bubba kernel and within a few hours it died. Im thinking about sending it To htc, but I dont no if They will repair it within my warrenty. Has anybody got suggestions how To boot it up or something, tell me!
I have no idea what HTC will do if you send them the phone, but since it's is totally dead (=useless for you) and it can't be switched on (not easy to determine that you have modded it), you can try your luck.
The fact that it did not happen to you within a limited period of time does not mean the problem does not exist. "100.0% confidence" looks very ironic next to that statement.I personally tested Candy Rom days before release and have been using it since without any issue so I have 100‰ confidence in this slim based Rom, I was also tester for bubba kernel....
A lot of people got their phone bricked only after several months. Developer of CM, for instance, has been developing CM on M4 for nearly half a year untill that happened to him; I got lucky and my phone died within first half an hour; all other reports are ranged somehwere inbetween those two numbers, randomly.
[IMHO]
I'm not sure specifically about CandyRom, or bubba kernel, but this is much more likely to have cause this issue rather then an Xposed module you are suggesting.
The only configuration for M4 known to be safe is a Sense-based ROM + Sense-based kernel. Anything CM-based = ticking time bomb, everything else = lottery.
[/IMHO]
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