I'd unplug the sound card or disable onboard sound for a test run.
When I start my computer, I get humming and crackling sounds as soon as the boot screen appears. These sounds continue through boot up. I get to the Windows is starting screening, the computer crashes and reboots itself. I CAN start Windows and log on in Safe mode, although the electrical noises continue intermittently. I don't know if this is some kind of hardware problem or a Windows problem. I checked device drivers while in safe mode, updated a few and everything else was already up to date. Here is a link to a video of the attempted start up.
https://drive.google.com/file/d/0B6y9TBtkNh3sRVlqejRUM3NMdU0/view?usp=sharing

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