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No lights or fan movement may indicate a power problem. Lights with a black screen can indicate a display or hardware problem.
What to look for
A logo followed by an error may suggest a startup or operating-system issue; repeated clicks may signal storage trouble.
Protect your information
Make note of recent upgrades, power interruptions and error wording. Avoid repeatedly rebooting a computer with a failing drive.
When to seek help
A technician can use those observations to prioritize testing while protecting important files.
This guide is general information, not a substitute for diagnosis of a specific device or network.
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