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Many things can cause the computer not to turn on, including a bad power supply or system board It can also be a result of the system not being plugged in or an improperly connected hard drive Check the hard drive ribbon cable to ensure that the red stripe is aligned with pin 1 Sometimes your friends may play practical jokes on you Many power supplies are now configured to support 120 or 220 volts (European standard) Verify that someone did not change the setting to the wrong voltage setting to see if your troubleshooting skills are up to snuff
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Once the BIOS has finished the POST, it looks for the presence of an OS on the hard drive If the BIOS does not find a special OS pointer in the drive s master boot record, it assumes that no OS exists If you haven t yet installed an OS, you must do so at that point If an OS exists but cannot be accessed, try using the SYS command at a DOS prompt to make the drive bootable That is, reboot the computer from the floppy drive (This command is described in more detail in 10) Use the command SYS C: This command replaces the pointer in the master boot record, and the computer might be able to boot properly Unfortunately, most cases of a missing OS stem from the corruption or loss of essential OS files If this is the case, you need to reload the OS When data becomes corrupted, it might be a sign that the disk is about to fail You should consider running Scandisk to resolve these problems You might also want to consider replacing the hard disk before it fails completely Before you do this, boot from a floppy disk, then try to access and save any salvageable information from the hard drive
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If Scandisk reports finding corrupted data, consider replacing the hard drive Data becomes corrupted when it resides on a bad spot on the disk It is common for a hard drive to develop a few bad clusters before it fails completely This can also occur when a system is powered down by pulling the plug Usually the operating system will be able to deal with power down problems, but it can occur occasionally
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CD-ROM and DVD drives are functionally similar, so you can install or troubleshoot them using similar methods A common problem with either of these devices is that the computer will report it can t read the disc First, check to ensure the disc is inserted the right way The label must be facing up so the drive can access the data from the underside of the disc Next, visually inspect the disc Scratches or smudges may prevent the computer from reading the disc Try another disc in the drive to rule out the media as the cause Cleaning the laser lens may also help solve the problem Commercially available CD-ROM cleaning and repair kits are readily available to restore CDs or clean the laser Make sure you follow the directions in these kits, as improper use may cause more problems than they solve If the drive is the problem, check the Device Manager to ensure it has been recognized Reload the device s driver if necessary, and check its system resources If the problem persists, check the ribbon cable connection and jumper setting Try the drive in another computer to pinpoint it or rule it out as the cause of the problem
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Typically, the only symptom of a failed parallel port is that the device attached to it will not work or not be detected by the computer First, turn the device off, then back on again Next, try restarting the computer If there is still no response from the device, try the device in another parallel port or another computer If the device functions properly, chances are that the original parallel port is at fault You will also want to verify that the BIOS on the system has the malfunctioning port enabled Check the port s resource settings in the Windows Device Manager to ensure that it is not conflicting with another devices IRQ settings If this is not the cause of the problem, test the function of the port using a loopback adapter, which, when connected to the port, can diagnose the port s ability to transmit and receive signals
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