Cpu powers on but does not boot

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rckbh1 Posts 1 Registration date Wednesday June 25, 2014 Status Member Last seen June 25, 2014 - Jun 25, 2014 at 01:03 PM
xpcman Posts 19532 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Jun 25, 2014 at 06:36 PM
Been in the shop for 2 weeks and they still cant figure out what is wrong. will not boot up even with boot disc. When turned on it says Acer and then goes dark.

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xpcman Posts 19532 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 1,829
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.
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