Need a power supply expert 3

[nob1]

Not sure about the sequence of events after you press the ON button. I have a Gigabyte GA-81HXP MoBo with a 2.8 P4, 512Gb RAMBUS. It suddenly decided not to boot. You press the button the fans start up, the power supply light comes on - and then everything goes off. As far as I can discover, as the supplies come up a 'power good' signal is sent from a chip on the MB to the PSU to maintain the supplies. All the supplies seem to coming up (checked with multimeter)but I'm not sure if the 'power good signal' is a pulse or a permanent voltage and if I can measure it or not. Common sense tells me that the PSU is overloaded so I changed the PSU for a 500 watt PSU with the same result. This meant there was a possible power line short to deck so I changed the MB! Same result! What do I do now? Any help would be greatly appreciated.

 

[nob1]

Yes the advice has been great. I don't think I have learnt so much in such a short time since I did my CompTia A+ core hardware exam!!!

 

[nob1]

I have successfully flashed the BIOS on the Intel 845 board now and the P4 2.8 is reporting 1.86GHz! I wound the FSB up to 800 (to give 2.8Ghz) and it crashed so I am beginning to suspect that the MB doesn't work with that processor. The blurb says works with Pentium 4. BIOS claims to auto detect CPU speed - it doesn't. Instructions on the web site tell you Load default setting in BIOS after flashing. Don't! What you should do is Load optimised settings! I'm giving up now!!!!

 

[LloydSev]

It may also be that the CPU is damaged and will no longer clock to 2.8GHz..

Computer/Network Technician
CCNA

 

[nob1]

Lloydsev: Is that possible? How can I check the CPU other than put it in a MB?

 

[garebo]

You CAN find out at intels website. They have a list of cpu's that will work for that mobo.
Plus, you can plug the numbers on the cpu in at intel and it will give you info on the cpu itelf, then you can better see if its rated for that mobo you have.


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