Cpu powers on but does not boot
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rckbh1
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Jun 25, 2014 at 01:03 PM
xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Jun 25, 2014 at 06:36 PM
xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Jun 25, 2014 at 06:36 PM
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xpcman
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Jun 25, 2014 at 06:36 PM
Jun 25, 2014 at 06:36 PM
When the computer's power is first turned on, the CPU initializes itself, which is triggered by a series of clock ticks generated by the system clock. Part of the CPU's initialization is to look to the system's ROM BIOS for its first instruction in the startup program. The ROM BIOS stores the first instruction, which is the instruction to run the power-on self test (POST), in a predetermined memory address. POST begins by checking the BIOS chip and then tests CMOS RAM. If the POST does not detect a battery failure, it then continues to initialize the CPU, checking the inventoried hardware devices (such as the video card), secondary storage devices, such as hard drives and floppy drives, ports and other hardware devices, such as the keyboard and mouse, to ensure they are functioning properly.
Once the POST has determined that all components are functioning properly and the CPU has successfully initialized, the BIOS looks for an OS to load.
So the POST routine has found a problem. These problems are best diagnosed with a special add-in card that display the POST codes. Laptops do not have a slot for the diagnostic card. With out this POST code it's all just guess work.
Once the POST has determined that all components are functioning properly and the CPU has successfully initialized, the BIOS looks for an OS to load.
So the POST routine has found a problem. These problems are best diagnosed with a special add-in card that display the POST codes. Laptops do not have a slot for the diagnostic card. With out this POST code it's all just guess work.
