Question about Intel D915GAG Socket 775 Motherboard - 915G Chipset - Onboard Audio, Video, Lan - MicroATX

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Board power is ok but run cpu&fan plz give me answer

915 model motherboard is board power is ok but no run processor no run

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1.Check the Electrolytic Capacitors on the motherboard. Specifically the one's around the processor. These are Voltage Regulators for the processor.
The processor must have DC voltage within a specific range. This zone, or range is very small. Too much voltage, the processor turns off, or won't start up. Too little voltage does the same.

This link will show what Electrolytic Capacitors look like, and what they look like when they are failing, or have failed,

Electrolytic Capacitors are the number one weakest link, of computer hardware failure.
For ease of explanation of construction of them, they look like little aluminum pop cans, they have a rubber seal at the bottom of them, and inside them they have Electrolytic paste.

When the capacitors start to fail, the paste inside develops a gas.
(Hydrogen gas) This gas expands, and pushes the against the seal. The seal's edge pushes out of the 'can', and paste starts to ooze out. So much paste loss, and the capacitor operates at a weakened state. Too much paste loss, and the capacitor fails.

Besides the motherboard capacitors failing, the next area to watch are the one's in the power supply. Power supply's have voltage rails inside. More specifically, they have a 3.3 volt rail, a 5 volt rail, and a 12 volt rail. Voltage may be thought of as the 'speed' of electricity. Amperage may be thought of as how much.
Volts times Amps = Watts.

If you have a power supply with weak, or failed capacitors, you won't be getting the full wattage your computer needs. Your motherboard power light will light up, other lights will light up, fans will spin, and the harddrive sounds like it's working.

ALL the lights use less than 1 Watt.
EACH fan uses 2 to 3 Watts.
The harddrive just sitting there spinning it's platters, uses about 3 to 5 Watts.
PROCESSORS use 55 to 125 Watts!!

So you see you can have lights lit, fans spinning, and the harddrive spinning, but when BIOS tries to turn the processor on, it can't!
Not Enough POWER!

Posted on May 24, 2009

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