Bought laptop for daughter for Christmas BUT when we powered it up, it didnt go very far. We have stopped it and started it several times and it continues to stop just after the ACER word comes and goes, then a blank screen, then it shows a 12 digit "number" which includes letters/numbers/symbols. this font doesnt allow me to recreate the "number" but this is close ... 62*EAE62*EAE ... and this "number" is followed by a blinking line
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You did not post anything about make and model. This is kind of a guess.
My laptop has "battery saving" setting that operate the fan based on temperature. When I start up, the fan comes on and the computer checks itself, Then the fan slows down. Later when the laptop warms up, the fan speeds up. See if you have some power management scheme set that makes the fan run like this before you take it to the shop.
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
try reseating the memory cards in the notebook if the lights come on but no display usually memory cards have been knocked loose.
that is one defect that they have is memory cards come loose if the laptop has been jarred from being in a car getting bounced around in the seat etc.
the memory cards control a portion of the video and if the memory cards lose connection you loose video.
Generally you can remove passwords by removing something called the CMOS battery. This battery retains the configuration of the computer when the AC power and main battery aren't present or working.
The battery is generally located in the RAM expansion bay. Locate the battery and remove it. let the laptop sit without ANY power connections for at least 30 minutes. When 30 minutes or more has passed, replace the battery and connect power. Boot the laptop and press F2 to enter the BIOS setup. Generally no configuration is necessary on laptops so just save and exit.