Which is it?CPU or MB

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Microsoft

Hi. Short of substitution or test equipment, is there any way to choose
between the CPU or Mb for failing to even get a POST, no less a Bios.
The fan works, but nothing else, including the floppie drive, so I can't
recover the bios, if in fact there is anything wrong with it besides not
showing up. I will eventually stumble on someone to test the two items,
but meanwhile does anyone have an idea, hunch, to share with me? TIA
 
/Microsoft/ said:
Hi. Short of substitution or test equipment, is there any way to choose
between the CPU or Mb for failing to even get a POST, no less a Bios.
The fan works, but nothing else, including the floppie drive, so I can't
recover the bios, if in fact there is anything wrong with it besides not
showing up. I will eventually stumble on someone to test the two items,
but meanwhile does anyone have an idea, hunch, to share with me? TIA
Click to expand...

Happened here, and it was the power supply.
 
Assuming you have made a visual inspection of the MoBo and have found no
obvious signs of electrical short or exploded capaciters, substitution
(remove and replace) or test equipment are the only options to obtain a
definitive answer to a non-POSTing MoBo.

Will it POST an error beep(s) with ONLY the power supply connected? e.g. no
RAM, no Video card, no Mouse, no Keyboard?
If not, you are failing at one of the first three steps of the POST, as
follows:

1. The first step of POST is the testing of the Power Supply to ensure that
it is turned on and that it releases its reset signal.

2. CPU must exit the reset status mode and thereafter be able to execute
instructions.

3. BIOS must be readable.

4. BIOS checksum must be valid, meaning that it must be readable.

5. CMOS be accessible for reading.

6. CMOS checksum must be valid, meaning that it must be readable.

7. CPU must be able to read all forms of memory such as the memory
controller, memory bus, and memory module.

8. The first 64KB of memory must be operational and have the capability to
be read and written to and from, and capable of containing the POST code.

9. I/O bus / controller must be accessible.

10. I/O bus must be able to write / read from the video subsystem and be
able to read all video RAM


Good luck,
Steve
 
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