Tons of problems on my MacBookAir

Well, I had a first generation MacBookAir (1,1) used for a price really low. The person who already possessed it says that the screen has been replaced, it's what he told me. Later, I realized that I can't adjust the brightness to 100% or I'll get a kernel panic. Also, I can't pass over mac os x 10.7.3 or I'll take a gray death screen before I have the chance to open a session. At the same time, the computer becomes very slow, due Kernel_Task who was devouring my cpu and what makes my mac unusable.  I have 'fixed' the task of kernel on Lion by going to system/library/extensions/ioplatformfamilyplugin...blahblahblah...and MacBookAir1_1 the deletion. But the problems mentioned previously are still present. Also, a few more problems are recently appeared... twice these past months I received a notification telling me to replace my battery soon, and, for some reason any, whenever I create a new partition on my hard drive, SSD, it seems to be corrupted. He was named "disk0s3 or 4" instead of the name, I gave him and it will not mount. I have fix it. in single user mode, but.. which seems to be a hardware problem on my SSD. What is software?

(Not OS X related)

I tried to install Windows 7/8/8.1/10 in EFI mode. I tried with 7 isos different (good isos) copy on a usb GPT partitioned and tried with 3 different usbs. Well, I have never spent a screen saying black something like "a recent hardware or software change will not let you boot...". Cause: An unexpected error has occurred... error 0xc00000... do not know how many zeros... 0000e ". Because they say, it's maybe a hardware problem... This is the screen that was replaced? I was able to successfully it boot in the BIOS with the MBR, but who live!

Conclusion

(1) I'm never buy anything it is used again.

(2) is the problem of the screen? Or is my messed up EFI? Well... I DON'T LIKE. If you have a solution to all my problems (apart from buying a new computer, lol) then post them here on this thread (no, duh, where else...)

(3) and if you can't help me... at least show me how to solve the problem of cpu of 150% kernel_task, which seems to be bothering me again in Snow Leopard!

Yes. 150% Kernel_task in snow leopard. The method that I've applied to correct it on Lion does not work on SL, and I can't find anything on the internet.

Let's focus on fixing kernel_task on snow leopard. Ignore everything else. Sorry for the mess.

Reset the SMC can solve a problem.

Reset the management system (SCM) controller on your Mac - Apple Support

And good luck!

Tags: Notebooks

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