What is a hard disk and how can it run on a computer?

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?

Hi,

I have recently bought a Samsung DVD ROM to replace my CD ROM. I have connected all the parts of it properly even though it is not displayed in My Computer. I use P4 windows SP3 with 2GB RAM. Expert please help me with this.

Thank you.

I am using Dell Vostro 1014 Laptop. My Operating system is Windows 7. Router is Dlink. I have changed router password with my Laptop. I have tried for a long time. But I cannot connect to internet. I cannot understand why the problem is going on after changing the password. Your help is needed.

What will happen if motherboard touches the cabinets that side metal where mounting holes are located with out the yellow- gold colored heads and screws and what is the difference between Intels duel core and core 2 duo processors ?

I have fall into my keyboard shortcut problem. It is OK from starting my computer for one and half hour.

Then I face this problem.

When I press I or E, all the program running is shown in the status bar

When I press L, my system goes for Log off.

Please Help me.

My motherboard is Gigabyte which has four SATA ports. I used two HDD in my computer one of them contained OS and another only for storage. But after replacing my processor it does not recognize any of my HDD. I have tried many times (changing cable, Changing HDD) but still the problem occurs.

So help me about it.

I am using windows XP, The Caps Lock of my keyboard is always flickering. So that I can not do anything for writing. I have already connected a USB keyboard but same thing appears here. Please anyone  tell me the solution.

My hard disk is three partitioned that means C, D & E.

I can not access two of its drive, but when I download anything from internet, the download file can save into those drive.

Now what steps I can take to solve this problem.

I can restart my pc from start menu and CPU. But mouse and keyboard do not work and one of them work after restart my pc. mouse and keyboard do not work simultaneously after restart.

How can I resolve this situation?