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Verify AC power by plugging another electronic device into the wall outlet If the other device receives power, the outlet is good If the outlet is good, connect the laptop to the wall outlet and try to power on If no LEDs light up, you may have a bad AC adapter Swap it out with a known-good power adapter A faulty peripheral device might keep the laptop from powering up Remove any peripherals such as USB or FireWire devices

The CPU gives a command to a device using a pattern of ones and zeroes called an I/O address Every device responds to at least four I/O addresses, meaning the CPU can give at least four different commands to each device The process of communicating through I/O addresses is called, quite logically, I/O addressing Here s how it works The chipset extends the address bus to the expansion slots, which makes two interesting things happen First, you can place RAM on a card, and the CPU can address it just like it can your regular RAM Devices like video cards come with their own RAM The CPU draws the screen by writing directly to the RAM on the video card Second, the CPU can use the address bus to talk to all the devices on your computer through I/O addressing Normally the address bus on an expansion bus works exactly like the address bus on a frontside bus different patterns of ones and zeroes point to different memory locations If the CPU wants to send an I/O address, however, it puts the expansion bus into what can be called I/O mode When the bus goes into I/O mode, all devices on the bus look for patterns of ones and zeroes to appear on the address bus Back in the old Intel 8088 days, the CPU used an extra wire, called the input/output or memory (IO/MEM) wire, to notify devices that it was using the address bus either to specify an address in memory or to communicate with a particular device (Figure 614) You won t find an IO/MEM wire on a modern CPU, as the process has changed and become more complex but the concept hasn t changed one bit! The CPU sends commands to devices by placing patterns of ones and zeroes I/O addresses on the address bus.

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Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

No two devices share the same I/O address because that would defeat the entire concept To make sure no two devices share I/O addresses, all I/O addresses either are preset by standard (for example, all hard drive controllers use the same I/O addresses on every PC) or are set at boot by the operating system You can see the I/O addresses for all the devices on your computer by going into Device Manager Go to the View menu option and select Resources by type Click on the plus sign directly to the left of the Input/output (IO) option to see a listing of I/O addresses, as shown in Figure 615 Whoa! What s with all the letters and numbers The address bus is always 32 bits (even if you have a 64-bit processor, the Northbridge only allows the first 32 bits to pass to the expansion slots), so instead of showing you the raw ones and zeroes, Device Manager shows you the I/O address ranges in hexadecimal Don t know hex No worries hexadecimal is just quick shorthand for representing the strings of ones and zeroes binary that you do know One hex character is Figure 615 Viewing resources by type, with I/O used to represent four binary characters Here s the key: addresses expanded 0000 = 0 0001 = 1 0010 = 2 0011 = 3 0100 = 4 0101 = 5 0110 = 6 0111 = 7 1000 = 8 1001 = 9 1010 = A

If the laptop is booting (you hear the beeps and the drives), first make sure the display is on Press the FN key and the key to activate the screen a number of times until the laptop display comes on If the laptop display is very dim, you may have lost an inverter The clue here is that inverters never go quietly They can make a nasty hum as they are about to die and an equally nasty popping noise when they actually fail Failure often occurs when you plug in the laptop s AC adapter, as the inverters take power directly from the AC adapter

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