Startup problems with new motherboard

[rjshine]

Installed new MB, CPU and RAM. CMOS settings are wrong everytime I start up the system, so I reset and system tries to reboot but does not. I lose the video signal but the cpu and hd continue to run only components installed are the hd, floppy drive, cdrw and dvd(read only).

It's a PCCHIP mb model 955G, with P4 3.0mhz cpu and 1 gb of ram i can't remember the brand. I've read the manual and removed and reinstalled components and I'm missing something here. Any help would be appreciated.

RS

p.s. I've also tried a new CMOS battery...no change problem still there.

[ski]

Make sure you're existing power supply that has all of the required connectors for the updated MB/CPU.

If that's ok and the CMOS battery replacement took less than 30 minutes, then reset CMOS either with a MB jumper(see MB's instructions), or by removing the CMOS battery for at least 30 minutes.

If no luck, then do a barebones setup by installing only the power supply, MB, CPU, memory(reseat it), video card(reseat it, sometimes it needs a good push to fully seat), monitor, keyboard, case speaker, and power button, and make sure the power supply's voltage selector switch is set to the correct voltage and the PS connection to the MB is securely seated.

If you do not lose the video signal, then connect all drives and install all remaining cards one at a time until the problem resurfaces.
Either the last item installed is bad(swap it out), or the power supply does not have sufficient capacity to run all of the system's components(swap it out with a lsrger capacity unit).
(NOTE: It's recommended to reformat the existing HD, and reinstall Windows as the HD contains info for the old setup.)

If you still lose the video signal with the above barebones setup, then place the MB on a piece of cardboard. If that works, then the MB is shorting out when installed in the case. Check for a loose screw, standoff, etc., inside the case, and also remove any standoffs which do not line up with MB holes. If none is found, then remove all MB screws and metal standoffs, and install paper washers(manila folder paper works good for this) between the MB and the screws/standoffs.

If the problem still happens with the MB placed on a piece of cardboard, then either the MB, CPU, memory, or video card may be bad. Make sure the correct memory type is being used, and install the memory in different slots(Note: Install individual memory modules).
If still no good, then swap out the MB, CPU, memory, and video card to find out which one is defective.

[airgun25]

i agree with ski on this . did you buy a mobo chip combo . if the are oem i would check that also. depending where you bought them . you may only have thirty day to send them back . so check that out as soon as you can .

[rjshine]

Ski,

When I install the floppy or hard drive the system then the problems i noted in my first post occur again. So right now I've got to figure out what is causing that because the floppy and HD worked fine with the old motherboard.

What is weird about it now is (with no floppy or hard drive installed) the PS fan and CPU fan still run when I hit the power switch to shut it down? I'm not going to bother with it again until this weekend. Thanks for the help though...at least I know that the CMOS is not corrupted.

Roy

[ski]

If you get a display with the barebones setup and can get into BIOS without any problems, and if installing only the floppy drive with the barebones setup causes the problem, then it's possible that either the PS is undersized, the FD and/or its cable is bad, or the MB is bad.

What is the PS's watt rating?
Also, which video card are you using?

Did you check if the FD still works ok with the old MB?

[rjshine]

ski,

The PS's watt rating is 350 and I'm not using a vid card. The FD and HD work with the old MB and PS.

[ski]

Do you get a display and can you get into BIOS when the FD and HD are not connected?

If so, then see if you get a display and can get into BIOS when just the FD is installed(no HD) with the barebones setup.

If not and the original problem happens, then either the FD is bad, its cables are bad or incorrectly installed, the MB's FD controller or connector is bad, the MB is bad, or the PS is undersized.

If things work ok with just the FD connected, then connect just HD(no FD) with the barebones setup.

If the problem happens, then either the HD is bad, its cables are bad or incorrectly installed, the MB's HD controller or connector is bad, the MB is bad, the PS is undersized, or the HD has to be reformatted.