one question what is the different between closing window and minimize ?

@jind86,
Act I think it's possible.  There is a setting somewhere that you can configure whereby when U press the red [x] it will not minimise the app but to close it [except right now i'm in a meeting so i can't go through all the settings]

Alternatively, Y don't u just use Command-Q

so basically we can js leave out AC adapt on 24/7,with green light.??
more recommended compare to on n off?? cheersss

there is no effect for macbook pro, but it will use battery (1>1.5%)/hour.

happens on mine as well
its a sound from harddisk, but so far it hasnt cost me anything..no data loss or lag or what so ever
so dont really bother..probably hitachi HD are designed to be like that
because my hitachi external HD makes the same sound when i move it around when running while seagate doesnt

go to Applications > Utilities > Activity Monitor, and click on the System Memory tab. try to keep an eye on the green section...it shows you how much free memory do you have.

i wanna ask something about what are you referring to as 'slow', because ur problem may be ur hard drive. i suggest you try these things:

1. copy and paste huge files (maybe 10gb) around ur hard disk (meaning not from/to external). if it's slow, most likely hard drive problem
2. plug in two USB devices, and copy a file (the bigger the better) from one to another. if ur hard drive got problem, this shud not be slow.
3. when system hang, can you still move the cursor? if yes, likely its the hard drive. normally (from my experience) when not enough RAM, you cant do anything at all
4. have you been experiencing any kernel panics? where you get a black screen and a warning. if yes, more likely bad RAM
5. launch the applications that u normally use (safari, itunes, anything). then launch something heavy (photoshop, games). take note on how long it takes to launch, whether its normal or unusually slow. now quit the heavy app and launch it again. if it still launches slow, u dont have enough RAM. if it launches quickly, but very slow during the initial launch, bad hard drive.

anyway, try to have around 30% of ur hard drive free. the less free space it has, the slower the performance. a simple reason is because OSX is using that free space to kinda help the RAM a bit (virtual memory), so the more free space, the bigger the virtual memory, the better the performance. another more technical reason is about how the hard drive doesnt need to search for the whole disk to look for data...only searching the part it knows you have stuff on.