Hae macbook pro pc side won't boot up

It's hard to say without more information. When you say it doesn't boot, does the screen come on at all? (the first thing that shows during a boot attempt is a gray screen). If the screen does come on, what does it show? Also what year is the macbook pro?

pray

It probably means your hard drive is dead or severely damaged. You will probably lose all data that you haven't backed-up.

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Resetting the PRAM may do the trick:
You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won't work.

you've tried rebooting, you've reset the PRAM, you've done it all, but your Mac is still behaving strangely. What next? In certain circumstances, resetting your Mac's System Management Controller (SMC) can be a solution. This is sometimes necessary to restore normal lower level system functionality to your Mac.

Here's how to reset the SMC on any type of Mac (and any version of OS X) and the type of problems that it may resolve.
When & Why Reset SMC on a Mac? Some Common Hardware Reasons

Typically it's power and hardware related issues that can be helped or resolved by resetting a Mac SMC, particularly if you're having these types of problems:

* Issues with your Mac's cooling fans and fan management: fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc

* Power management and battery problems: Mac isn't turning on, sleep isn't working, random shutdowns and reboots, battery isn't charging, Mac won't wake from sleep etc

* Light problems and improper lighting management: battery indicator lights aren't working, display backlighting isn't adjusting to ambient light changes, keyboard backlights not working, etc

* Video and external displays not working: display brightness functionality not working properly, target video mode isn't working properly, external display isn't working, etc

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren't showing up, external devices are not being found, etc

So now that you've concluded you need to reset your SMC (Note that the SMC is on Intel Mac's only), here's how to do it on MacBook's, MacBook Pro's, iMac's, Mac Mini's, and Mac Pro's. Notice that the reset instructions are different for MacBook and MacBook Pro's if you have an internal or detachable battery.
Reset SMC of a MacBook Air, MacBook Pro Retina, or MacBook Pro's with an internal non-removable battery

This is how to reset SMC on most modern Mac laptops:

Shutdown your MacBook Air / MacBook Pro
Connect the power adapter to your Mac
On the MacBook/Pro's keyboard, hold down the Shift+Control+Option keys and the Power button at the same time
Release all keys and the power button at the same time
Boot your Mac as usual

Here's the key sequence to hold down:

Reset the SMC of a MacBook Air or Retina MacBook Pro

Do keep in mind that by resetting the SMC you will lose power specific settings, like the time it takes to sleep a Mac and other customizations to power settings. No big deal, but if you have made many changes to your hardware behavior you will want to adjust stuff like sleep behavior again.
Reset SMC of an iMac, Mac Pro, Mac Mini

Resetting SMC is different for non-portable Macs:

Shut down your Mac
Disconnect the power cord
Press and hold the Mac's power button for 5 seconds
Release the button
Reattach the power cables and boot the Mac as usual

Reset the SMC of a MacBook or MacBook Pro's with detachable batteries

mac reset the smc Older MacBook laptops with a removable battery can reset SMC with the following approach:

Shutdown the MacBook/Pro and remove the battery
Disconnect the power adapter, hold the Power Key for 10 seconds
Release the power key and reconnect your battery and power adapter
Turn your Mac on
Let boot as usual

Hopefully that will clear up your problems, if not it might be worth a visit to the Apple Store or a certified repair center.

Happy New Year,
Kerry

You need to reinstall your OS, If you need help let me know I can walk you through it ...

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.

Try plugging your laptop into a monitor to see if the laptop boots up but the screen doesn't work.

If you have an image on the secondary monitor, sounds like the lcd on your laptop is defunct and should be repaired or replaced by an authorized Apple dealer or repair shop.

Either way you can take your MacBook into your nearest Apple Authorized repair shop and have them look into.

Placing back the keys is not possible manually except that you stick it, and thats the worst thing you would do. if you have an apple service center nearby, get it serviced by them as they need to open the lower case of the macbook to do that.
Btw is it Macbook or Macbook Pro? Because macbook pro has a unibody which can not easily get the keys back into position if they popped off.

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You should only use Windows xp for running a program that is not yet available from Apple. There shouldn't be much reason to link to the net while in Windows. Also while in Windows you are wide open to any viruses that exist. Try getting your work done without getting on the net, then go back to your Apple format. There you are 99% free of viruses. … Still need to link onto the net let me know I will ask at our Apple Computer Club on Monday

Dale