HT4718 On the Mac x utility screen my system is asking for "system lock PIN"

Question

I have forget my password of MacBook Air. I tried to reset by holding the Command R while booting. But on the Mac x utility screen it is asking for system pin. I don't know what to do. Please suggest. I am ready to reinstall the is but don't have any disk

Answer 1

I'll respectuflly disagree with Paul_31's advice about ordering replacement disks. We know that whatever your model is, it's capable of running Mavericks. But there are some models of Macintosh that shipped with OS X 10.5.x that can be upgraded to Mavericks, and if you order exact replacement disks for that model from Apple, you will wind up with the 10.5 operating system, which can't be upgraded to Mavericks by itself, since the computer needs to be at 10.6 to upgrade to Mavericks. You can purchase OS X 10.6 installation disks from Apple for $19.99, but that, too, may be useless, because your model may be too new to support 10.6.
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
CSound1 is on the right track, because he's probably trying to get you to a screen that can display information about your Mac - such as the serial number, and perhaps the amount of installed memory.
If you can't get to a screen to show your serial number, see this link:
http://support.apple.com/kb/ht1349
Once you get your serial number, you can get general (and more specific) information about your Mac from one or both of these links. (The second link is not an Apple site, but has reliable information):
https://getsupport.apple.com/ProductSelector.action
http://www.chipmunk.nl/klantenservice/applemodel.html
Once we know more about your model, then we can advise you how to proceed. Here's another question. Is it your intention to completely erase the internal hard drive of the computer (which will also erase all of the installed programs on the computer)?