Savvy, I think that is what he tried to do.
Make sure your bios is up to date.
I don't know much about Toshiba (and laptops usually have a proprietary bios), but many BIOS will have a spot where you can turn off onboard sound. Maybe that got turned off by accident?
If you restored your system to a time when everything was operating properly, then it shouldn't be a software problem.
One final way to test this theory is a bit time consuming. It involved getting a "Live" cd. This is a Linux distribution (usually) that boots from CD. The A70 is fairly standard so it should have the drivers needed. If the live cd plays sound, you know it is a software issue. If it is quite as well, probably a hardware issue (which on a laptop means new mobo 95% of the time).
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