startup problem maybe mobo

trying to fix computer for friend cant get the keyboard or mouse to work and when i plug in a usb mouse that doesnt work either so i have purchased a PCI usb card and installed now have light on the mouse but before i installed the new card i removed the CMOS battery to try and reset the system now on startup i get the following
CMOS checksum error - Defaults loaded Warning! CPU has been changed or CPU ratio changed fail. Please reenter CPu settings in the CMOS setup and remember 2 save b4 quit.
i cant do anything cant press f1 or delete to get further into system
motherboard is MSI PM8M-V running windows XP and i cant seem to get into the setup page to even try to change settings
as i have never experienced this problem b4 (am relativly new to this can do basics) i am baffled on how to fix or if mobo is fried please help

 

More than likely a mobo issue, BUT... to help diagnose you should remove all parts that are not required for boot. (I.E. PCI devices, hard drives, optical drives) The fact that you're not getting power via the onboard USB ports though is a pretty clear indication that the motherboard is failing. Only other thing that I can think of is a bad PSU, but that's not nearly as likely

 

tried new psu new cmos battery machine was booting up till battery removed just couldnt use kb or mouse. thanks heaps for your help thought it may be mobo but wasnt sure

 

Hi Rox,

Borrow PS2 Keyboard and mouse until you get it running. USB can do strange things especially with older systems.

Good Luck, Jim

 

thanks Jim but the PS2 keyboard and mouse on the mobo and usb on mobo dont work even tried usb with an adaptor on the PS2 thats why i have had to install a PCI usb card hence cant get into setup to change any settings Thanks heaps for replying System is a P4 with 256ram and 160 hd on board graphics CPU? not sure

 

have changed the jumper to the clear data setting without restarting pc then back to the keep data setting and booting with same message do i have to restart with the jumper on the clear data setting for this to work book states you can clear cmos by shorting 2-3 pin while system is off. then return to 1-2 possition which i did not starting pc till back to 1-2 pos then it says to avoid clearing the cmos while the system (I dont do anything with the machine plugged in) is on as it will damage the motherboard

 

Hi Again Rox,

True that the CMOS usually will not reset by removing battery if left plugged in but, probably will not damage anything. Some MBs may need the battery left out several hours. The Jumper turns off the battery and discharges the Caps in the circuit almost instantly so should not need the comp unplugged.

Luck, Jim