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If the start up sound plays and the hard drive sounds normal try connecting the computer to an external monitor. If the external monitor shows the desktop just fine then the cable connecting the laptop to its screen is probably going bad.
If the computer will not boot at all try zapping the PRAM by
Pressing the power button and then command-option-p-r before the gray screen comes up.
Hold those keys down until you hear the startup chime.
Let go of the keys and let the Mac reboot.
If that doesn't work try booting from an install disk and run a repair utility.
startup and regular sound White screen appears but no apple logo appear ,
1) smc have been reset multiple times. possible motherboard video hardware issue cause over heating.
2) hold option key switch on laptop it will be see hard disk or DVD drive (apple disk inside) icon, the motherboard good if icon appeared. and the motherboard video dead if not appear. hope to help a little
firstly check if there is any signs of beeping sound when you switch on the laptop.
if not sound that means, you might have a problem with you processor or the mainboard.
but if you hear the beeping sound when booting up the laptop, try to use an external monitor or screen to chcenk whether the system is working fine or not. connect an external screen to the vga com port on the laptop and hold on function key (fn) and press f5 to see if the external screen displays something.
if yes, then you will need to replace the screen and if no, then send the laptop for service
Try this: log in to single user mode by holding command-s when you power it on. You should see it boot into a command line screen, black with white letters. type in the following: /sbin/fsck -y then enter... This will error check the hard drive and fix any errors if it finds them. If it won't boot into single user mode, hold option when you start it and see if you have any choices of startup discs - if not, you might have a bad hard drive; on the other hand, if you hear the drive spinning, but it's not allowing you to boot from it, a re-install might be in order. Best of Luck! www.dfwsupergeek.com
If it is repeatedly beeping it sounds like a memory issue. you should try removing your memory one stick at a time and attempting to reboot.(remove one try to start, replace, remove other try to start). If it doesn't work with either stick try using a "known to be good" or new stick of memory and see if it starts. Here is a link explaining how to remove and change/upgrade your memory. Very simple really, involves removing the battery and removing a plate with three screws in it.