Mid9042 problem! Please help me, anyone!

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I have a Coby Kyros MID9042. Okay, I'll start from the beginning. My device's earphone socket and speaker had been stopped working. I couldn't do anything without sound so out of boredom I opened it. I thought I fixed the problem so I assembled it back , switch the power on but the screen became white , I can still use it but theres no color!!!!!!!!!!! Please anyone help help help!

 

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My speaker and earphone socket is not working and I don't care about those now. Is there a usb sound card or any usb earphone that I can use so that It can produce sound? I bought a sound card and it did'nt work, it only works for desktop pc. Any help would be very much appreciated.