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Have a look at this site "www.crucial.com/uk". Use the "System Scanner" towards the bottom of the page left side, next to Memory Advisor this will scan your pc and will then tell you what memory you require. Hope this helps.
If you are talking about the number symbols that are on keys
U,I,O,P,J,K,L,M then notice what color the number symbols are on those
keys. Normally they are blue or might have a square around them. That
means you have to press and hold the key that is the same color or has
the square around it on the left side of the keyboard. Normally you
would Press and Hold the FN function key at the lower left hand portion
of the keyboard, then hit the key for the number you want. Notice that
the FN function key will be the same color as the numbers. If it's not
the FN function key then it will be the key that has the square around
it like the numbers has.
check the sound icon bottom right corner right click on it to adjust volume or to untick mute if this does not work you might not have a sound driver loaded.type in your comp details and download sound driver from internet. hope this helps.
If u work continously then ur keyboard not coming long time.Bcoz laptop keys are very smooth,compare to desktop keyboards and very expensive too.I suggest that better to u purchase USB connector keyboards.