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AMD legacy pc will on boot on second try

By lococat ·
Have a user with AMD duron pc on an abit MB. has a network card, video card, cd rom drive and hard drive, nothing unusal inside at all, and I exchanged the ps to a 400 watt ps.

Problem is that the machine never boots on the first attempt, but will always boot on the second attempt. Can anyone tell me why, and if I can fix this problem. It's not a major issue, the machine is stable on the second boot, but I'd like to resolve this for my peace of mind.

thanks

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AMD legacy pc will on boot on second try

by sgt_shultz In reply to AMD legacy pc will on boo ...

when it never boots first try, what does it do? silence? fans? any video? any motherboard beeps? starts, then quick death?

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AMD legacy pc will on boot on second try

by lococat In reply to AMD legacy pc will on boo ...

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AMD legacy pc will on boot on second try

by opatzg In reply to AMD legacy pc will on boo ...

What that normally points to is something not seated all the way. reseat all cards, connections and see if taht makes a difference.
Does it ocur after powering off all the time or just first attempt of the day?

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AMD legacy pc will on boot on second try

by lococat In reply to AMD legacy pc will on boo ...

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AMD legacy pc will on boot on second try

by TheChas In reply to AMD legacy pc will on boo ...

I have had a boot problem with a number of Socket A motherboards.

Every time, the 'fix' has been to manually set the CPU FSB and multiplier in BIOS settings.

This is especially true for motherboards that use SDRAM.

For an SDRAM motherboard with a Duron CPU, the FSB will be 100MHz
The multiplier as needed for the CPU frequency.

Try this link for further information.

http://www.sudhian.com/faqs/

Chas

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AMD legacy pc will on boot on second try

by lococat In reply to AMD legacy pc will on boo ...

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AMD legacy pc will on boot on second try

by csmith In reply to AMD legacy pc will on boo ...

If it locks early in the boot, (black screen or video card BIOS display) the problem is in the "power good signal".
This can be the power suipply sending the Power Good siganl before the voltages are in specification, or the MB is not waiting for Power Good before begining the POST routine.
There is nothing wrong with the cards, RAM or CPU.
Nothing is loose.
This is a BIOS / Power Supply issue, in this case.
Have seen both, but usually the problem is the power supply giving the Power Good Signal too early.
More rare is the BIOS error in the 500Mhz - 1000 MHz AMD MBs.
The post error code for this problem will be C0.
(Assuming you have a diagnostic card.)
Easy cure, just update the BIOS.
Regards, Chris

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AMD legacy pc will on boot on second try

by lococat In reply to AMD legacy pc will on boo ...

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AMD legacy pc will on boot on second try

by donmars In reply to AMD legacy pc will on boo ...

More info on symptoms after first boot attempt would help. Consider the clues you give though, and I would have to side with answer number 4. You replaced the power supply and now this. The symptoms all point to timing and the power good signal.Whenthe power supply first starts up, it takes some time for the components to get "up to speed" and start generating the proper DC voltages that the computer needs to operate. It can take a half-second or longer for the power to stabilize, and this is an eternity to a processor that can run half a billion instructions per second! To prevent the computer from starting up prematurely, the power supply puts out a signal to the motherboard called "Power Good", after it completes its internal tests anddetermines that the power is ready for use. Until this signal is sent, the motherboard will refuse to start up the computer.

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AMD legacy pc will on boot on second try

by lococat In reply to AMD legacy pc will on boo ...

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