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On a laptop, the "Num Lock" key has a function slightly different than the one it performs on full-d desktop keyboards. Activating "Num Lock" on a laptop usually transforms a set of central keys, including many letters, into number keys, allowing typists used to entering numbers on a keypad to type efficiently. While on desktop keyboards "Num Lock" usually has a dedicated key, on laptops it often shares a key with another function on MacBooks, for example, it shares the "F6" key and you must hold down the "Shift" or "Fn" key to activate it.
Look for the "Num Lock" key on your laptop's keyboard. This is usually near the top of the keyboard. If the key says nothing on it except "Num Lock" if that's the only function the key performs you can just press it to activate the lock; a light will probably go on somewhere to indicate that "Num Lock" is on. If the key has multiple functions, you'll have to hold down a different key while pressing it. Hold down "Shift" and press "Num Lock" if the writing saying "Num Lock" appears above some other writing on the key, the way various symbols appear above the numbers on the keyboard's number row. Hold down "Fn" and press "Num Lock" if the writing saying "Num Lock" appears in a different color often light blue that's shared by the "Fn" key.
With the first recovery disc in in the drive, and starting from a powered off machine, press the power button and then press quickly and repeatedly on the F12 key. The boot menu should appear. When it does, make sure that CD/DVD/Optical whatever drive is highlighted. If it's not, use the up and down arrow keys on your keyboard to highlight it. When it's highlighted, hit the enter key.
The second you see a white message on a black screen that says...."Press any key to boot from CD" hit a key and begin to follow all the prompts.
See page 23 of the manual here: http://global-download.acer.com/GDFiles/Document/Generic%20UG/Generic%20UG_Acer_1.0_A_A.zip?acerid=634079355121696686&Step1=Notebook&Step2=Aspire&Step3=Aspire%205551&OS=722&LC=en&BC=Acer&SC=EMEA_27
Num Lock + *
When Num Lock is on, the embedded keypad is in numeric mode. The keys function as a calculator (complete with the arithmetic operators +, -, *, and /). Use this mode when you need to do a lot of numeric data entry. A better solution would be to connect an external keypad.
In other words, hit the "Fn" key, and without letting go, hit "F11". That will allow you to type numbers.
Usually F1, F10 or F12 are the right ones to hit when your computer starts to get the RESTORE DISC function. You will have to be able to hit the key several time when the computer starts so that it accepts the key press. IF you have a partition that has the restore disc on it, I would restore your computer to its original configuration and then I would mirror your discs onto dvd's or cd's for safe keeping. If your harddrive goes out, you will have nothing to restore your computer with then. When you find the correct F key it may also have the option to make your own restore discs. I would do this as soon as possible.
I just came here looking for a solution to the same problem. I have an Aspire 1800 which has a front panel of buttons for the Arcade mode. Basically i just wiped all the buttons again resonably vigiously as i was pissed off and low and behold the FnF6 works again. I tried this after i read another artical suggesting the removal of the touchpad driver. so obviously something is still depressed much like a sticky key which basically switches the screen immediatly back on as i had a flicker at least when i did FnF6. Hope this helps..
I am using ACER (Aspire 4520),with Windows Vista BASIC & then once i have format my laptop & install Vista Ultimate on it from that time my webcam is not appearing on desktop & I am enable to use web cam & another problem is when I have install yahoo massager that was installed on the time I start working all of the sudden it disappear plz provide me solution of this
try holding down the function key and hitting the numlock or scroll lock key, this is usually how you engage or disengage the laptops function keys on the keyboard. Most laptops have a light that will turn on and off when you do this, indicationg that the funtion keys are in use. depends on the brand