I don't understand why my computer restarts automatically after every few minutes.

I checked every cable for loose connections, but that did not solve any problem.

I am using a Windows XP and now I want to use Windows 7. When I installed Windows 7, there was no sound coming out from my speakers. My computer shows that the speaker cannot be detected. I have connected my speakers and everything is ok but my computer cannot detect it. What should be done?

In my computer there is a fan for CPU. when i bought my computer this fan doesn't make any noise , but now it's very noisy , someone told me that it is because it's dirty and i must clean it, i did this but there is no changes.
what can i do to fix this problem? and i want to know if there is some fans make noise usually and other doesn't?

I am using Vaio VPCW216AG  which have a wireless network adapter named Atheros AR9285. I am using windows 7 operating system. Recently I have formatted my laptop & after installation of OS I am having problem with my wi-fi connection.But I have installed all the driver software.Please help me out.

The UPS connected to my PC would supply power for about 30 minutes but during the two weeks the UPS is showing only signal light as like as a multi plug but it fails to supply power for a single moment, How can I solve this problem?

Hello friends,

I am searching for some suggestion from you. I have a HP scanjet 4600 series scanner, but when I scan any documents it comes with some green lines on the scanned documents. I think the scanning LED got some problem. Any suggestions please?

I have a Toshiba external hard disc of 500 GB, for few days it is making some problem.

When I plug it into my USB drive the blue led start to blink but I did not found it in my computer. 

I have all my files over there, 

Please help me out.

I am using windows 7; 1 GB of RAM, the main problem of my computer is that it restarts automatically after 10 minutes. Again it restarts after 10 minutes again and again. I have changed my power supply. So what is the major problem in my pc?

I bought a computer 2 years ago and did not face any problem till date. But now it has started to give me some problems.

I do not understand at this moment the reason or cause for this problem. That is, when I start my computer, it does not open.

I checked the power supply and every thing. My RAM and other cables are also ok.

Please make me understand, what is my computer's problem?

My computer does not have a bluetooth yet id would like to share data with another computer. When i connect my computer with another one to make them communicate, what colour combination should i use for to enable them communicate.