Will using a 45w charger on my mac book pro 13 that came with a 60w charger cause operating problems?
Sine using a 45w charger my laptop cannot get past the grey/white loading screen?
MacBook – Mac book charger
chargermacbook propower
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Best Answer
Using a lower powered AC adapter than the one that shipped with your Mac shouldn't cause the issue you're experiencing.
Typically the only side effect to using the lower wattage adapter will be the inability to boot your Mac if it's battery is dead, since the lower wattage adapter doesn't provide enough power to power on the Mac without supplemental battery power.
The grey/white loading screen could be either a software issue or hardware issue. To test this you can try the following.
If all of the above fail and/or your hard drive doesn't show up in Disk Utility or as an option when booting with option held down then you are likely experiencing a hardware failure.
Hopefully that gives you a good starting point and/or resolution!