IPhone 4 slider not working

My sister has jailbroken her iPhone 4 and the slider isn't working and it won't let her unlock her phone and when she connects it to ITunes it just keeps trying to load and I've restarted the phone multiple times and nothings working please help

Hold top and home button until restart

If she downloaded iUnlock tell her to try to get it into safe mode or hold the power up button when it boots up. When it's done booting either disable iUnlock or remove your passcode to unlock your phone.

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