I have a MacBook. When I turn it on the monitor turns gray and it starts beeping loudly and it does not boot up but it continues beeping. It starts with two beeps and continues with three beeps every 2-3 seconds. There seems to be a CD stuck in it as well.
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Re: beeping before booting
Probably the RAM. Take it out and put it back in to check. You will need some RAM to boot, so try each stick separately if you can. I'm guessing though that you'll have to get at least one other stick of RAM to check. You'll probably find that one is bad. It's probably covered for life, but that would be a good reason to upgrade it.
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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.
When you say "load up screen", I assume you mean the Apple boot screen (it has the apple on a gray background).
You might try resetting the PRAM on the macbook.
You can do this by pressing and holding the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
So, turn the macbook completely off. Turn it on and immediately press and hold the Command-Option-P-R keys until the computer reboots and chimes. Once it chimes, release the keys. Your system should boot normally.
the beep pre-boot is signaling a kernel panic. It could be bad ram or something else, it's hard to tell without hearing the beep (they signify different things)
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable taken from http://www.welovemacs.com/whdoallthbme.html
So depending on the beep, it means different things. However in any case I'd suggest taking it to an Apple Authorized Repair Facility. Unless you feel comfortable with assessing the proper solution on your own
Check for a failing hard drive
Trying booting from the Mac OS X install disc.
insert the Mac OS X install disc.
press the start button, while holding down the "C" key on the keyboard
Once you are running from the disc. go to Disk Utilities select the hard drive
click the "repair permissions" button at the bottom.
If you get any red errors listed or it doesn't seem to finish
repairing the permissions you have a failing hard drive and it will need to be replaced.
If the repair permissions finishes without any problems. You will have to reinstall the operating system.
Is this a trick question? There is no "DOS mode" on a MacBook Pro.
Do you have WIndows installed as part of Boot Camp, and your machine is booting into Windows? To boot back into the Mac, either use the Boot Camp control panel in Windows, or hold down the Option key after you hear the startup chime and select the OS X partition to boot from.
Boot from the CD/DVD that came with your Macbook. Launch 'Disk Utility' and perform 'Repair Disk' as well as 'Repair Disk
Permissions' on your boot drive and hopefully that will fix the issue.
If that doesn't do it, try holding the Option key during startup to select the boot disk and select your Mac HD. If it boots in this manner there are rumors about some bad SuperDrives out there causing this boot issue. So you may want to boot it while holding "D" and run the Apple Hardware Test from the DVD/CD.
Start the computer and hold down the "C" key when you hear the start up chime. Keep holding down the key until the computer boots into the OS installer. You are going to have to reinstall the OS. Just follow the instructions from there.