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The yellow mark indicated the multimedia audio controller driver was not installed, therefore the audio won't work/no sounds.
You need to identify the make and model of the audio card and if you haven't the audio installation CD then you can download the driver from the manufacturer's WEB site.
Since the repairer fixed your computer, he should have installed the audio driver. I suggest you get the repairer to install the audio driver as it should have been part of the repair service.
Also if you see any other yellow marks against any devices in the DEVICE MANAGER then these will also need the drivers installed.
Ok that means you need a driver for each of those. You will either have to go to the manufacture website (ex. dell.com) or the motherboard manufacture (if you built it yourself) look up the correct model pc/motherboard and download the drivers for each item (ethernet, multimedia controler). After you run each of the downloads either it will remove the exclamation mark or if not you can right click the item with exclamation and hit "update driver" and click next through all the menus and it should install.