Mac not starting up blue screen

When I turn it on, the screen becomes a deep blue instead of a light grey.

I have recently replaced the ram with 8gb from another MacBook 15". I have tried removing the ram, and it detects the missing memory with the periodic single beep, so I don't think that is the cause. The fans still runs at startup, not excessively either, so I don't believe the cpu is overheating or the sensor is bad. I have tried all key combinations to reset the nvram, startup in verbose, startup in single user mode, safe boot.

When I plug in the charger, the light goes to green to orange so I don't think it could be the battery. I still have the HDD in the original location. Hi yes I have tried to replace the memory with the original,, and this issue did start after replacing the memory, but it started a few days after the replacement.

If any of those allow a "normal" boot no blue screen hang then the problem points to software, not hardware, and a reinstall of the OS is probably needed. If this answer is acceptable please remember to return and mark it accepted. I don't quite know how to target boot from the 15", but regardless I don't have access to it anymore. I have tried the R boot and the D boot and neither seems to work.

So I suppose it would be a hardware error. Do you have ideas as to which part it may be? If so, is it replacable? I would suspect the HD - but the only confirmation would be a successful boot from some other volume. Either an install disk, a net boot, or from a target booted other machine. Tow target boot the working machine hold the T key at boot, then you connect via Firewire or USB ports and hold the option key on the bad mac to choose the good volume. So I replaced my optical bay with a solid state drive, so I have 2 hard drives, one original hard disk, one solid state.

Ah yes, the spinning beach ball that refuses to go away.

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Sometimes it's a small, application-specific problem that's easy to solve, but other times it's part of a much bigger mess. If your Mac is tossing up the spinning beach ball consistently, it's time to figure out the exact cause. Your Mac will usually get a spinning beach ball when it's somehow overloaded.

More often than not, this just lasts a few seconds and goes away, in which case you can ignore it. If it doesn't, the best way to figure out what's going on is to launch Activity Monitor and pinpoint which program is causing the problem.

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If it's a powerful piece of software like Photoshop that's causing problems, then it's a good chance you need more RAM in your computer. RAM can help with multi-tasking issues , and if the beach ball comes up when you're running a few programs at once additional RAM will help this is very easy to install yourself. If not, and it's something lightweight like a file syncing service like Dropbox or an instant messenger client like Adium , then it's probably a problem with the software itself. Try quitting the app and seeing if the problem persists. If the beach ball doesn't return, then you have your problem.

When your hard disk is full it can cause spinning beach ball problems. For a lot of us, this just means cleaning up two folders: In a lot of cases, doing the above two steps can free up enough space to continue working.

Step 2: Safe Boot

That said, you might still need to free up even more space. To make this process easy, we like Disk Inventory X. With Disk Inventory X, you can look at your hard drive and find the biggest space hogs quickly so you can delete them and move on. It takes a little time, but if you follow our guide you'll have your hard drive cleared out in no time.

Of course, it might also be time to just upgrade the size of your hard drive. A few other oddball things can cause the spinning beach ball. If none of the above work, here are a few more resources that will help you troubleshoot the problem.

If you've ever experienced the black and grey kernel panic screen above, then you know how scary and completely unhelpful it is. When one application has a problem, you get the spinning beach ball mentioned in a previous section, but when multiple programs fail—or the operating system itself—you get a kernel panic. Thankfully, it's not usually as big of a problem as it seems. In most cases, a kernel panic will force you to reboot you computer.

1. Step 1: Run Disk Utility.
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6. Troubleshooting Mac Problems: Stuck at the Blue or Black Screen?

Let this happen, and if you load right back into OS X, continue working on your computer as usual. In a lot of cases, the issue resolves itself and you can move along.

How to Fix a Mac Laptop Stuck on a Boot Screen

If not, or if it happens only when you use specific programs, it's time to figure out what's going on. Running Software Update can often fix kernel panic problems because more often than not, it's a software issue. Click the Apple icon in the top left corner, and select "Software Update. If for some reason the kernel panic happens when you're starting up and you can't load OS X, then you'll need to try and start up in safe mode.

Reboot the computer and hold down the Shift key until the Apple logo appears. After a little while, you'll load up safe mode, a stripped down version of OS X. Here, you can still run Software Update the same way as you usually would. It's also worth visiting the developer's web site to see if other people are having a problem with a recent update or release. By doing this, a list of available startup device will display on the screen.

Choose a device from that list to boot your Mac. Once desktop appears on Mac, be ready to repair the permission issue. Now, you have to enter this command in Terminal.

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After entering this command, press Enter key. Now, you will be asked to enter the administrator password, just enter it accurately and hit Enter. Enter the following command and press Enter key at once. Hold these buttons until you see scrolling text on the screen.

Once the text stopped to scroll, Command Prompt will appear on the screen. Now your Mac OS X will boot from startup-drive. Share 2.