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Apple Computing Products:
macOS - Notebook Hardware
PC card slot woes
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<blockquote data-quote="techound1" data-source="post: 665957" data-attributes="member: 16113"><p>A computer's PMU (Power Management Unit) is relevant to (among other things) port issues (USB/FireWire ports appear dead) and resetting it should be worth a shot.</p><p></p><p>The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of the PowerBook and iBook. As the name implies, it is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output.</p><p></p><p>Over time, the settings in the Power Manager may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, not charging the battery, or not seeing the AC Adapter, among others.</p><p></p><p>Performing a PMU reset returns the iBook and PowerBook hardware, including NVRAM, to default settings and forces the computer to shut down.</p><p></p><p> 1. If the computer is on, turn it off.</p><p> 2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.</p><p> 3. Wait 5 seconds.</p><p> 4. Press the Power button to restart the computer.</p></blockquote><p></p>
[QUOTE="techound1, post: 665957, member: 16113"] A computer's PMU (Power Management Unit) is relevant to (among other things) port issues (USB/FireWire ports appear dead) and resetting it should be worth a shot. The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of the PowerBook and iBook. As the name implies, it is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output. Over time, the settings in the Power Manager may become unusable, which can result in operational anomalies with the computer. Examples include not turning on, not waking from sleep, not charging the battery, or not seeing the AC Adapter, among others. Performing a PMU reset returns the iBook and PowerBook hardware, including NVRAM, to default settings and forces the computer to shut down. 1. If the computer is on, turn it off. 2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes. 3. Wait 5 seconds. 4. Press the Power button to restart the computer. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
PC card slot woes
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