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Dealing with System Startup Problems
There's nothing scarier than turning on your computer and finding it doesn't start. What you do next depends on exactly what it is your computer is or is not doing. Let's work through some specific startup problems, and how to proceed in each instance.
Problem: Your Computer Doesn't Start—You Hear No Noises and See No Lights
First things first—don't panic
Now, very calmly, look at the back of your system unit. Is the power cable plugged in to the right connector? Now follow the power cord to the other end. Is it firmly connected to a power outlet? Now check the wall switch. Is it turned on? Now walk to your fuse or circuit-breaker box. Is the fuse good or the circuit breaker set? Now go back to your computer. If it still isn't working, unplug the computer from the power outlet and plug in something that you know works—a lamp or a radio, perhaps. If the appliance doesn't work, you have a bad power outlet. If the appliance does
work, you really do have computer problems.
If you're positive that your computer is getting power and that you're turning it on correctly, you probably have a hardware problem. The most likely suspect is the power supply in the system unit. To determine the culprit and fix the problem, however, you'll need to call in professional help at this point. Take your system to a certified repair center and let its technicians get to work.
Problem: Your Computer Doesn't Start, but It Makes the Normal Startup Noises
If your system is making noise, at least you know that it's getting power. Because you can rule out a bad power cord, the most common things to look for are poorly connected cables or a nonfunctioning monitor.
Begin by checking your monitor. Is it turned on? Is it plugged into a power outlet? Is the power outlet turned on? Is the monitor connected to the correct port on your system unit? Is the connection solid? Is the connection solid in the back of the monitor? Are the brightness and contrast controls turned up so that you can actually see a picture? If you have a newer monitor, try disconnecting the monitor from the computer (with the monitor turned on); if the monitor is working correctly, you should get a No Signal or Lost Signal message on the screen.
If everything is connected and adjusted properly, you might have a monitor that needs repair. Is the monitor's power light on? If not, your monitor might have power supply problems that need attention from a professional. If your monitor's little green light is on but nothing shows onscreen, the video card in your system unit might be loose or set up incorrectly. Try swapping monitors with another system; if the new monitor works on your system, your monitor is the problem. If you determine that your monitor is working fine, you should check your video card to make sure it's installed, seated, and connected properly. If that doesn't fix your problem, try plugging your video card into a different slot.
It's also possible that your keyboard isn't plugged in properly, or that you have some other internal problem that causes your system to halt during start-up. Check all your connections before you try rebooting. good luck hope i helped you.