Why it takes a long time for my MacBook Air to turn on?

I brought my MacBook Air at a Power Mac Center to fix vertical lines on the screen. The vertical lines were removed. But since then, when I turn on my laptop, it takes a long time before it actually turns on. Sometimes, after pressing the power button, something seems to run at the upper left corner of the keyboard (near the power adapter) but it takes me practically hours before it actually turns on.
And when it is turned on already, I observed some unusual behaviors happening:
- Sometimes, while it is turned on, the battery status in the menu bar looks operating normally, but after a while, the trackpad will no longer work until the battery status says, "No Battery Available" and "Power source: Power Adapter".
- Sometimes, several horizontal lines appear on the screen then after a while the laptop will hang up.
- Sometimes, the sound sounds abnormal then after a while the sound no longer operates, and when I check the Sound at the System Preferences, it says, "No input devices found"
- Several applications do not work anymore, like Calendar, TextEdit, Reminder, Facetime, Preview and others.
Please help me figure out the problem. I cannot use my laptop as regular as before. I can no longer catch up with paper work deadlines because of these problems.

Please, help me. I need an immediate response so I could try to fix the problem because I need to use my laptop right away. Pls help.

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    I quit the X11:
    ==========
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    AFTER quitting X11, I can see something related X11 is stilling running:
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    Mar 1 00:46:06 n219073058253 org.x.startx[335]: xauth: timeout in locking authority file /Users/Michael/.Xauthority
    ==========
    So what actually causes this problem?
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    It turns out that there's something wrong about permissions.
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