i Apple All-in-One PC shows red safe boot when it is turned on, it is not smooth after entering the system, and rebooting is useless, how to solve it? Urgent!!!

safe boot is a safe mode, so after entering the system runs very slowly, in the exclusion of hard disk problems, it is recommended to reinstall the system,

Another 5 solutions are provided,

1. reset the PRAM

2. change the keyboard, it may be the Shift key is broken.

3. Unplug all peripherals except keyboard and mouse.

4. Verify disk permissions, fix disk permissions, verify disk, fix disk.

5. Reinstall Lion.

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