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Please mention your mac model and system version.
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Please mention your mac model and system version.

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Sure, it is a Mac OS X version 10.8.4<br />
Processor: 2.6 Ghz<br />
Memory: 8gb
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Sure, it is a Mac OS X version 10.8.4
Processor: 2.6 Ghz
Memory: 8gb

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Thank you experts, I really appreciate all your answer. I haven´t had more problems with my computers, but I am going to take into account your suggestions.<br />
<br />
Winter
</div>


Thank you experts, I really appreciate all your answer. I haven´t had more problems with my computers, but I am going to take into account your suggestions.

Winter

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<div class="content wysiwyg-content">
Dear experts,<br />
<br />
Today something happened with my mac computer. I was working with no problems, then I went for a cop of coffee and when I came back I found a black screen and a very faint form asking for my password (It was really hard to see that form). so I try to press the power button that nothing happened. I pressed it for like 10 seconds (as I used to do with my windows computer) and it seems something sounded but I kept getting the black screen. then I decided to plug it in and and plug it out and for some reason it worked (the battery was at 57%), but it seems it restarted but itself because I was prompted to enter my mac password. <br />
I have no idea what happened, but of course it closed all the programs that I was working on.. <br />
Not sure how to check it is have a virus of a hardware problem. Could you please help me to troubleshoot this issue?<br />
<br />
Thanks in advance,<br />
<br />
Winter
</div>
</div>


Dear experts,

Today something happened with my mac computer. I was working with no problems, then I went for a cop of coffee and when I came back I found a black screen and a very faint form asking for my password (It was really hard to see that form). so I try to press the power button that nothing happened. I pressed it for like 10 seconds (as I used to do with my windows computer) and it seems something sounded but I kept getting the black screen. then I decided to plug it in and and plug it out and for some reason it worked (the battery was at 57%), but it seems it restarted but itself because I was prompted to enter my mac password. 
I have no idea what happened, but of course it closed all the programs that I was working on.. 
Not sure how to check it is have a virus of a hardware problem. Could you please help me to troubleshoot this issue?

Thanks in advance,

Winter

mac restarting for no reason

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.

Apple OS

Programs written for the Apple operating systems are distinguished from software created for other operating systems in that it must be approved by Apple for use on its devices, whether it is from Apple (Final Cut, iWork, Keynote, Logic Pro and GarageBand are popular titles), or is a third party application from Parallels, Nuance, Microsoft and Amazon, among many others.