How to Reset MacBook Firmware

Power on the MacBook and wait for a warning message that reads 'To continue booting, type 'mac-boot' and press return' to appear on the screen. The firmware on your MacBook must only be reset in the event that this message appears.
Enter 'reset-nvram' in the prompt following the warning message. This resets the non-volatile memory on the computer. This type of memory does not lose information when the computer is reset.
Press the 'Return' key.
Type 'reset-all' at the next command line prompt, and press 'Return' to reset the firmware on your MacBook. This also forces the computer to restart.
Wait for the MacBook to reboot. By the time the laptop restarts and boots into Mac OS X, the firmware is successfully reset.
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How to Run Mac OS X Leopard on a PC (5 Steps)

Insert the Mac OS X install disc into your PC, right click on it and select 'Make CD/DVD Image.' If you don't have this option, then you may need to install a program like Nero or Magic ISO Maker.
Download the PC-EFI patch for Leopard OS X and follow the install instructions to patch your Leopard ISO file. This patch makes it possible to install OS X on a PC without manually changing your BIOS (firmware) settings and patching OS X to run on PC processors.
Insert a blank DVD and burn the patched OS X install. Select a slow burn speed to minimize write errors. If your DVD-burning software has a 'verify disc' option, then enable it while burning the Leopard disc.
Restart your computer and press the F12 key during startup to boot from the OS X Leopard disc. Choose the appropriate installation for your computer's processor (i.e. select the AMD install if you have an AMD processor), choose the language for OS X and select your installation preferences. Note that not all OS X software works perfectly on a PC, so a minimal installation is recommended for first-time 'hackintosh' builders.
Restart your computer once the installation is finished and follow the on-screen instructions to set up your admin account for OS X. If you ever want to go back to Windows, then insert a Windows installation disc, restart your machine, press F12 during launch and boot from the disc.
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How to Troubleshoot Mac USB Issues (7 Steps)

Check that the USB device is connected to the appropriate jack. There is a USB jack in the back of most keyboards, but it often only works with a mouse.
Unplug any USB devices and wait a few moments before reconnecting them. You can often fix problems with your USB keyboard and mouse by using this method. Try restarting your computer if the malfunction persists after you reconnect the USB device.
Test your USB peripherals in another computer. If the problem exists in the second computer, you may need to have the device serviced or look for an updated version of the firmware that supports your USB item. Check the manufacturer's website for these updates.
Try different devices in the same USB port. For example, if your mouse if behaving strangely, see whether an external drive or an iPod is able to connect to the computer via that USB port.
Disconnect any USB hubs that you're using and connect each device one at a time to your computer. You need to troubleshoot the devices individually to find out whether the USB hub or the one of the devices is causing the problem. Be sure to test each peripheral with a working USB cable.
Reset the parameter random access memory (PRAM) and nonvolatile RAM (NVRAM) on your computer. Turn off your computer, then restart it and immediately press and hold the 'Command,' 'Option,' 'P' and 'R' keys on the keyboard. Release the keys after you hear the startup chime for the third time and your computer should boot normally.
Consider reinstalling the operating system after clearing your computer's hard drive. Be sure to back up all of your data before you erase the disc. You may also want to bring the computer to a Mac service center and have the logic board examined.
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