issue with changing FSB on MOBO

[JCROCCO]

I have the same mobo on 4 computers. I update the CPU's on all of them from 1.8/400 fsb to 2.8/533 fsb. In oder to change the fsb, I had to change a jumper on the mobo from 100 mhz to 133.

This worked fine on 3 of them, but on the 4th one, when I change it, it doesnt boot up at all.

It not the CPU. I changed it with others that worked, and put it in the other computers and it worked.

What could cause this?

The bios says it is still at 100 mhz, and my 2.8 is only running at 2.1/400 instead of 2.8/533.

Has anyone seen this before?

It is a P4, PCchips 922LU mobo.

PS: I did post this in motherboards forum for the past two weeks and no one has even answered so I am trying here.

 

[RadiclDreamer]

Can the memory handle the added speed as well? Power supply?

 

[JCROCCO]

Yes, all 4 computers are the exact same, so the PS are the same, and I replaced all the memory to max out 2 gig on each machine , done all at the same time with the same type of memory. 3 work perfectly, one just doesnt.

 

[JCROCCO]

Even though the memory I just installed, it most liekly wasnt new, So I ran a memtest on it for 8 hours and no problems. In the past, errors would usually show up within the first 1 or 2 hours of testing.

I still dont know why the mobo is doing this. I may try swapping out the memory just as an added test, but doubtful it will work.

 

[KGB]

On the affected MB, try clearing the CMOS first and then try booting @ 533FSB.

 

[JCROCCO]

I know if I clear the cmos, I will lose all the bios settings, but is that really a bad thing as I can reset them? I just want to make sure it doesnt actually screw up the bios. My flashing utility for the bios doesnt seem to want to work, on any machine. According to the mfr, I need an updated bios to use this chip, but the update didnt work, it still reads the old bios numbers, but the chips do work, in all the other machines except this one. What would clearing the cmos do different than editing the bios?

 

[KGB]

Clearing the CMOS is not the same thing as editing the binary info in the BIOS.

Clearing merely sets it back to default values. Editing the .bin would enable a custom BIOS with either additional features or capabilities.

Whenever you adjust setting in the BIOS, those settings are saved and retained. This can sometimes (more times than people realize) get garbled or corrupted and needs to be reset. This has nothing to do with your BIOS flash.

Whay can't you flash to the newest BIOS?

 

[JCROCCO]

Not sure why. I d/l the files from the manufacturere, and then boot with it in the flopy and I get to the installer program, but the installer program fails or it says it cant verify the bios or something like that. No matter what, it doesnt read the information, or change the info. I tried to flash it on two or 3 computers, but not all 4. I put new chips in all 4, and they all work except this one, however this one was also one I tried to flash the bios. The one I know of that I didnt try to flash the bios worked perfectly And remember, the chips work fine in all other computers, so it has to be the mobo or the bios or the cmos.

If I clear the cmos, then what? Do I go back to the bios setup and set the parameters as I need to? Can this allow the jumper setting to work?

 

[SJP0tato]

Originally posted by: JCROCCO
If I clear the cmos, then what? Do I go back to the bios setup and set the parameters as I need to?

Yes

Originally posted by: JCROCCO
Can this allow the jumper setting to work?

Hopefully