List of issues: random reboots, sound issue, battery reading

Hey all,
I am having the following issues with my Macbook (late 2007, running on Snow Leopard).
1) The battery power indicator isn't giving a correct read. It remains stuck at 95% or 99% most of the time while the led on the battery cord is burning bright green for hours...
When I asked my local reseller if this could be related to my new bought battery, he checked the battery (which is under warranty) and informed that the battery was ok so he feared it would a more expensive issue inside my Macbook.
2)When I turn on my Macbook, the sound isn't working althought the soundbar is more then halfway open. When I increase or decrease the sound with one tap, it suddenly kicks in and works fine untill I turn the device off and o. Then it's the same old story all over again.
3) My Macbook randomly reboots. Without any warning (atleast not visible to me) you suddenly the distinct hardware sound of a reboot, the grey load screen with the Apple logo appears and only a few seconds latter (it's much faster then a normal reboot/restart) I am at the inlog screen and have to log in again.
I am not sure but, it's possible that issue 2 & 3 showed up after I installed Snow Leopard. Don't know if it's relevant or not.
I am praying for this to be a software related issue, but I have a nasty gutt feeling that is going to be a nasty hardware issues
Any thoughts, idea's or wonder solutions?

I'll reply using the numbers aswell:
1) But is it also normal for the Macbook to keep saying that the (3months old battery) is at 99% even when it has been fully loaded in advance and has been connected for 12 hours to the powergrid?
2) I'll try to clearify:
You turn on the Macbook, according to the settings the sound is on yet programs like Adium and Mail don't produce sounds when it should be making a sound warning.
When you use the sound keys (either to increase or decrease the sound), the sound kicks in again.
Each time the device is turned back on this issue presents itself.
The device also doesn't seem to save the sound setting on which it is turned off, it simply resets to a setting at about 75 % of the volumebar.
3)I have been thinking that myself and have been expermenting with using the visitors account from time to time. However the reboots have been rare up till know (only 3 , max 4 times as far as I am aware) and only once (last night) when I was actually activly using the device.
This makes it rather annoying to downgrade or to switch main accounts permenantly for diagnostic purposes only. (I am not that familar with mac os to start doing this like downgrades at all to be honest)
Of the reboots I am 99.9% sure that they started after my upgrade to Snow Leopard.

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