I cannot illuminate the keyboard, and cannot hear any sound - Any ideas please?

......I hear nothing, (except the start-up jingle when turning on the MacBook), I also have no backlit keyboard. The volume shows at maximum, but having said that, there is a little symbol showing a small white circle with a line struck though it just under the volume display when one of the F buttons are pressed. This symbol is showing when I try to turn up, turn down, or mute, (or un-mute), this whilst using the F9, F10, & F11. This symbol also is evident when trying to illuminate the keyboard up, or down, (F5 & F6). I have gone into 'System Preferences', but am unable to move any sliders, which incidentally are showing maximum volume, not muted either - it almost as if something has locked up the settings, (which are NOT currently locked though via the padlock system). The speaker symbol at the top of the screen is of a light grey in colour, (usually black if I remember correctly), and certainly is not showing the Mac being muted. I'm not 100% familiar with a 'Mac' having moved from a Windows machine not too long ago, so any info wold be very much appreciated. Incidentally, whether this has any bearing whatsoever, when I turned my Mac on yesterday, (16-5-11), the time had reset itself to 00:00, and date back to 1-1-2001 - again, should anyone know why this took place, then it would be nice to know as I've never had this occur before on either a Windows or Mac machine. Sound & lights were working fine yesterday even after I'd put the time & date correct. The operating system is 10.6.4 on my MacBook Pro.
Thanks for taking the time to read this.

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