Iphone screen black but siri working?

I have a jailbroken iphone 5 running on ios 7 I was on cydia installing a tweek when I was playing with assistive touch and accidentally locked my screen unlocked it then it said that performing actions while installing something can be dangerous then it was stuck on configuring for like 25 mins the I powered off and turned it back on and everything was fine I opened an app and it was fine then opened cydia and it said that it couldn't install the tweek then it froze on cydia znd didn't let me click anything and turned black siri works but and I can't trn it off tried holding power and home but didn't work this happened to me before while using another app and I turned it off and back on but what i'm afraid of is that cydia might have caused a software problem. Did it cause a software problem? What do I do? If I wait till it dies will it turn back on? Please help As soon as possible!

Added (1). holding lock button didn't turn it off I did it for 40 sec holding home and lock didn't work iether

Might be a brick, hold the top button and home key at the same time for 30 seconds then it should come back on.

Christian, hold down the lock button for 30+ seconds. Once you've done that try turning it back on by holding down the power button in conjunction with the home button. If it does not turn on you will have to do a volume up reboot. To do this, simply hold down the volume up button and the lock button.

Omg thank you so much

I had this exact same problem
worked wonders sthanks so much!1

Thank you you saved my life

Awesome that is very helpful. Its now up and running again.

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