Intel DH55TC motherboard. Was upgrading memory, on rebooting got error message. Put old memory back and rebooted everything worked but, Lost all sound. Was running sound from video card - HDMI- to tv. Tried a Linux live from USB. Still no sound. Tried headphones. Still no sound. Thinking motherboard is bad. Checked bios, reset to default. Pulling battery and letting it sit overnight. Any ideas?