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Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to know that you are facing problem with your Dell computer.
Try to simple unplug all the devices like the hard drive dvd drive and if you haven any other devices connected to the computer unplug them The memory must be installed and the usb pci x card.
Let me know if it still hangs?