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meneghini
Paper Tape
Posts: 3
Registered: ‎11-13-2017
Location: US
Views: 1,482
Message 1 of 2

M91p Desktop (ThinkCentre) Motherboard not displaying

Hello everyone,

Recently my motherboard started to beep twice and just has a black screen. I made sure to have the power cables plugged in and everything. It did two beeps continually.  I redid all the cables and now it just beeps twice on start up (doesnt show up on monitor & backup monitor) and doesn't beep anymore.  

Thanks for any help! 

-Tyler

JDGillis
Bit Torrent
Posts: 2,402
Registered: ‎12-11-2015
Location: US
Views: 1,446
Message 2 of 2

Re: M91p Desktop (ThinkCentre) Motherboard not displaying

Note:   I am assuming you have the M91p Desktop shown at the support page here

  

Two short beeps points to a CMOS setting error (see page 67 of the Hardware Maintenance Manual linked below).  

 

ThinkCentre Hardware Maintenance Manual

https://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_pdf/0a23284.pdf

  

Beep Symtom:   2 short beeps - CMOS setting error

 Perform the following actions in order

  • Start the Setup Utility program and press F10 to Save and exit. See Chapter 6 “Using the Setup Utility program” on page 43.
  • Start the Setup Utility program and press F9 to load defaults and then press F10 to Save and exit.
  • Perform a Boot-block recovery. See “Recovering from a POST and BIOS update failure” on page 476

 

It sounds like you are not going to be able to get into the BIOS/Setup utility by pressing F10 since your screen is black, so you will probably need to reset your BIOS using the Boot-block Recovery steps shown below.

 

Note:  You will need to first download the latest 9HKT58A BIOS Update.ISO file and use the 9hj958usa.iso file to burn a CD from which to boot your system in step 8 below.

  

Recovering from a POST and BIOS update failure If the power to your computer is interrupted while the POST and BIOS is being updated, your computer might not restart correctly. If this happens, perform the following procedure to recover from the POST and BIOS update failure. This procedure is commonly called Boot-block Recovery.

 

1.  Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

2.  Remove the computer cover. See “Removing the computer cover” on page 79. 476 ThinkCentre Hardware Maintenance Manual

3.  Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system board” on page 77. 4.  Remove any cables that impede access to the Clear CMOS /Recovery jumper.

5.  Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and pin 3).

6.  Reconnect any cables that were disconnected and reinstall the PCI card if removed.

7.  Reinstall the computer cover and reconnect the power cords for the computer and monitor to electrical outlets. See “Completing the parts replacement” on page 113.

8.  Turn on the computer and then insert the POST and BIOS update (flash update) disc into the optical drive. The recovery session begins. The recovery session will take two to three minutes. During this time, you will hear a series of beeps.

9.  After the recovery session is completed, the series of beeps will end, and the system will automatically turn off. Remove the disc from the optical drive before the system completely turns off.

10.  Repeat step 1 through step 4.

11.  Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).

12.  Reconnect any cables that were disconnected and reinstall the PCI card if removed.

13.  Reinstall the computer cover and reconnect any cables that were disconnected.

14.  Turn on the computer to restart the operating system.

 

Best of luck,

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