Okay. To help you find out your mother board model #, you need to open your tower and get a flashlight so you can see good on the motherboard. You should be able to find a weird number like "755-A2". They also tend to be bigger letters then any other text on the board. That'll be the model number and most manufacturers have there own set of numbers for all their boards.
If you can't find it, try to hold the "Pause/Break" button on your keyboard when your computer starts up. The display text will tell you the motherboard model number and bios version. I'll only need the model #. If your computer starts up with a Logo, then get into the bios. All motherboards tend to have a different way of getting into the bios. Usually "F1, F2, F12, ESC or Del"...I'd try "Del" (Delete) first. Then try to find the start-up logo option and shut it off.
Once you can find the motherboard model number, it'll much easier to find you a manual. The reason I want the manual, is because some manuals show the positive and negative feeds of each plug insert for any external parts, such as the front audio panel. It'll help to know if the front panel is connected properly. (This includes the restart button, if it's plugged into the right feeds)
Try not to mess around with the Jumpers as this could damage the computer if you don't know what your doing. The manual will explain what each jumper is for.
whenever I put my computer in standby a few minutes later it turns itself back on , it has been like that ever since I got it. I am not sure why though
I've had a computer do this, but only with Vista. Once I had XP installed, then it worked fine. I never did figure that one out, I just took the easy way out and re-installed XP on it.
The BIOS is the place should your front audio panel not work, in case it's simply turned off. There is usually an option but computers tend to vary. The onboard USB's can also be turned on and off in the BIOS. Just the expansion ones though, the ones in the back of the computer have no option to turn on or off.
If you have any questions, I'll try to answer them as best as I can.