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2008 Durango - power lift gate won't open manually

It just wont Open, the Back door / Power lift gate, won’t Open.
Two quick beeps the signals flash and that’s it. Manual attempts from the back outside latch release result in the same, two beeps and signals flash, but the door won’t Open.
Is it the switches in the door or computer/software glitches ?
How much should it cost or should it cost anything if its a software issue ?