[Q] Apx Device and USB device not found. Please help!

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http://forum.xda-developers.com – Ohkay I am trying to restore my g2x using oneclickrecovery. I successfully do all the steps until I click on flash stock rom. I'm the beginning, when my hold both volume up and down and plug it in to the computer it will not say Apx Device. It would say like USB device not installed. But then I follow the steps anyway and it says Nvidia boot for mobile devices then I take it out open oneclickrecovery then I select flash stock rom. There would be a blue window and it would say USB device not found. I would look at my phone it wouldn't say S/W upgrade. Is there anyone who can resolve this pro (HowTos)