My MBA doesn't see anything.

Airdrop on my iMac sees the MBA, iTunes on the iMac can share my MBA iTunes library, but nothing works the other way 'round; my MBA can't see anything on the iMac. NoAirdrop on the MBA, no iMac iTunes library, nothing. Seems as if things only work one way around. Sharing is set up identically on both computers, and they show up as Shared in Finder
Any suggestions appreciated.

Just a clarification. The MBA can see the iMac iTunes library, but when I connect, it just shows the files in my MBA library

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    Folks,
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    This morning I tried to revive it with a mouse movement and no-go.  Okay, so I opened it up -- still no life.  Hmmmm, I pressed the power button a while so it would come back on, and it finally did, but no external display.  I read online about getting it to see external displays (something I didn't have to do yesterday) and tried "Detect Display", tried turning it completely off for five minutes and powering back on, tried disconnecting and connecting the cable, turning the display power on and off... nothing.  No matter what I do, I can't get the external display to work again.
    What in the #$%@# am I doing wrong?  I can't even think of anything else to try.  Leaving aside the fact that it somehow stopped working in the night during sleep mode, what can I possibly do now to get it going again?

    I thought I'd add a couple of things here that might be helpful to others searching for a solution to this or a similar problem.
    I happened to leave my MBA turned off for a while but with the external monitor connected.  When it came time to turn it back on I connected it to power (although it was pretty fully charged) because I had been reading this:
    http://gizmodo.com/5938452/a-trick-to-make-using-an-external-monitor-with-your-m acbook-way-better
    and in the bottom comments there was a section that read as follows:
    "Closed Clamshell Mode is still a function of the OS. Here's how: close the lid of portable, plug into power, monitor, and keyboard/mouse, wake portable by clicking the mouse or hitting a key on the space bar. Important note: portable has to be plugged into power, even if the battery is full."
    It was the last bit that seemed to make a connection in my mind that perhaps the big issue here was that I was trying to do things without the power connected, even with the Clamshell open.  In any case, the external monitor came back on and then worked just fine.  So I shut things completely down (power down) and restarted several times and each and every time it worked, and kept working even when I went to Closed Clamshell mode.
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    Hello, I'm having problems with a new motherboard I got from Amazon, specifically the 970a-g46. The following are my specs in use with this motherboard:
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    Quote from: rhradacut on 06-January-15, 16:49:14
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     None of the supported CPUs have integrated graphics, any MB graphics would be in the chipset, not CPU. Examples would be 785G, 880G
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    Once again thanks for helping out on solving my problem.

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