Laptop or desktop computer ? http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm One bad lead can cause a computer to continue on a cycle of restarting or to shutdown or fail to detect/ boot up a computer hard drive Test all leads that attach to your hard drive power and data cables IDE SATA the leads from your MOTHERBOARD TO YOUR HARD DRIVE make sure they have a secure dust free connections and are not faulty or just replace them they could be faulty motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail check all electrical power input and extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working also check the Cmos battery and computer RAM modules make sure they are securely seated with no dust built up or in the sockets on some motherboards cmos batteries are soldered in
Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty
make sure all leads that are attached to your dvd\cd floppy drives have secure connections and are not faulty or just replace them they could be faulty
computers need power and data to travel through every working device to continue its cycle and have an end so any faulty leads will end up with a computer error
even something as small as a faulty electrical or fan lead can cause you problems
check you CPU central processing unit make sure its securely seated and has thermal paste it might be getting to hot the thermal paste will help disperse the heat
Thermal compound is a sticky paste that is placed directly onto the CPU.
Allowing for a more direct heat transfer between the CPU and HEAT SINK and preventing air gaps from forming between the CPU and heat sink.
hope this helps
Computer is booting from a non-bootable source
Many times this error is caused when the computer is attempting to boot from a non-bootable floppy disk or CD-ROM. First verify that no floppy diskette
or CD is in the computer, unless you are attempting to boot from a diskette.
Note: This error has also been known to occur when a
memory stick is in a card reader and the computer is attempting to boot from it.
If you have any card reader or flash reader make sure that no memory
stick is inside the computer. Additionally disconnect all USB drives, cameras,
ipods, iphones, etc. from the computer.
If you are attempting to boot
from a floppy diskette and are receiving this error message it is
likely that the diskette does not have all the necessary files
or is corrupt.
If you are attempting to install
Windows XP or Windows 2000 and are receiving this error message as the
computer is booting verify that your computer BIOS
has the proper boot settings. For example, if you are attempting to run
the install from the CD-ROM make sure the CD-ROM is the first boot
device, and not the hard disk drive.
Second, when the computer is booting you should receive the below prompt.
Press any key to boot from the CD
Important: When you see this message press any key such as the Enter key immediately, otherwise it will try booting from the hard drive and likely get the NTLDR error again.
Note:
If you are not receiving the above message and your BIOS boot options
are set properly it's also possible that your CD-ROM drive may not be
booting from the CD-ROM properly. Verify the jumpers are set properly on
the CD-ROM drive.
Computer hard disk drive is not properly setup in BIOS
Verify that your computer hard disk drive is properly setup in the
CMOS setup. Improper settings can cause this
error.
Corrupt NTLDR
or NTDETECT.COM file
Below are the full error messages that may be seen when the computer is booting.
NTLDR is Missing
Press any key to restart
Boot: Couldn't find NTLDR
Please insert another disk
NTLDR is missing
Press Ctrl Alt Del to Restart
Causes
Computer is booting from a non-bootable source
Many times this error is caused when the computer is attempting to boot from a non-bootable floppy disk or CD-ROM. First verify that no floppy diskette or CD is in the computer, unless you are attempting to boot from a diskette.
Note: This error has also been known to occur when a memory stick is in a card reader and the computer is attempting to boot from it. If you have any card reader or flash reader make sure that no memory stick is inside the computer. Additionally disconnect all USB drives, cameras, ipods, iphones, etc. from the computer.
If you are attempting to boot from a floppy diskette and are receiving this error message it is likely that the diskette does not have all the necessary files or is corrupt.
If you are attempting to install Windows XP or Windows 2000 and are receiving this error message as the computer is booting verify that your computer BIOS has the proper boot settings. For example, if you are attempting to run the install from the CD-ROM make sure the CD-ROM is the first boot device, and not the hard disk drive.
Second, when the computer is booting you should receive the below prompt.
Press any key to boot from the CD
Important: When you see this message press any key such as the Enter key immediately, otherwise it will try booting from the hard drive and likely get the NTLDR error again.
Note: If you are not receiving the above message and your BIOS boot options are set properly it's also possible that your CD-ROM drive may not be booting from the CD-ROM properly. Verify the jumpers are set properly on the CD-ROM drive.
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