Macs are not immune to problems like other devices. Apple Mac, sometimes, not responds to the power button at all due to its OS X crash up or due to other reasons. One of the common problems that can cause the booting issues in Mac is connection of a bad peripheral. If your Mac just isn’t responding when you press its power button, then it’s time to scroll down to the Recovery Mode sections and fix the errors.
Step1: Run Disk utility
If your Mac is booting up but Mac OS X isn’t loading properly, there’s probably a software problem. Your Mac’s disks may be corrupted, and you can fix this problem from recovery mode. To access to the recovery mode, boot up your Mac or if you have time shortage, then contact Technical Support for Apple Mac by simply dialing the toll free number and troubleshoot your Mac boot up problems in minutes.
1. The first step on that front is to run Disk Utility. On a Mac running Mountain Lion, you can run Disk Utility by booting into OS X Recovery Mode.
2. Make sure the Mac is off.
3. Hold down the Command and R keys, and power the Mac back up again.
4. Click on Disk Utility. Then, click on your Mac’s built-in hard drive in the left column of Disk Utility.
5. Click Verify Disk, and then wait while Disk Utility does its thing.
6. In the case disk utility says it had found some errors and need to repair them. Then click on repair disk option. To know more keep reading the article and know more about the solutions
Step 2: Safe Boot Up
1. Safe boot checks the functionality of your Mac during start up process, and checks your hard disks needed in the process.
2. Simply shut down your computer while holding down shift key until the logo passes. To get some response about what's happening in your Mac, you might choose to start up while holding down Shift+ Command,+ V key : That enters Verbose Mode, which spits out some feedback messages about what Safe Boot is actually trying to do as it goes. It can take a while but if your Mac starts up with safe boot then restart the system and go ahead with your day.
3. Otherwise you can get connected to expert Mac support and help forums and get your problems solved instantly while reading the guidelines properly.
Check the peripherals
1. While using a Mac desktop, check that all its peripheral cables are correctly seated. Try reseating all the cables— to ensure they’re securely connected. If all other steps fail, try unplugging all peripherals one by one before trying to boot your Mac.
2. If your Mac starts back up without any issue, then you'll know that there is a problem with any of the peripherals. For this you will need to shut your Mac back down, reconnect all the peripheral one by one, and then restart your Mac.
Perform a power cycle
1. If your Apple Mac is not responding to power buttons, then you can fix it by unplugging the charger from it and forcing it to restart.
2. In modern Macs there is no removable battery, press the power button for about 10 seconds .IF YOUR Mac starts, force it to restart option.
3. On the other hand if you’re Mac has a removable battery in it simply shut down, and remove battery from it and reinsert it after 10 minutes.