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No Monitor, Mouse, & Keyboard


Best Answer Quartz , 04 August 2019 - 11:28 AM

Thank you very much for your time, effort, & information.  My opinion at this point is that it is the MB, especially considering that neither the video card and the onboard graphics work.... Go to the full post »


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#1
Quartz

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My PC has MSI A75MA-G55 Motherboard.  When it boots, there is no display & the keyboard & mouse do not work.  I disconnected the RAM & ASUS Radeon HD 7750 1GB Video Card, cleared CMOS Jumper, removed CMOS battery & reinstalled.  Nothing has worked so far.  Suggestions greatly appreciated.


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#2
zep516

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Hello,

I'd try a new CMOS battery.

Thanks
Joe :)
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#3
Quartz

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Hello,

I'd try a new CMOS battery.

Thanks
Joe :)

Thanks Joe.  Sorry, I forgot to add that I installed a new CMOS battery.  I have found that others who had the same issues found different fixes that worked for each.

 

The only thing I haven't checked at this point is the CPU.  The fan is working.  I don't know if it could cause all 3 of my issues.  I do get 2 beeps when I boot.  I have removed the Ram & tried one at a time, unhooked CPU from MOBO & reconnected, removed Asus video card, cleared CMOS, & disconnected SSD & Harddrive.


Edited by Quartz, 12 July 2019 - 03:19 PM.

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#4
zep516

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I'd be more inclined to think it's a possible power supply problem before a cpu, because it appears nothing is working, although a cpu failure could also cause just about any issue

What operating system is installed ?
What is the make an model of the computer ?

I have seen the monitor, keyboard, mouse issue resolved by replacing the CMOS Battery. Darn I was hoping that would work,

Thanks
Joe :)
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#5
zep516

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On further research,

Don't rule out the ram just yet..

According to your motherboard it has an AMI Bios.


2 beeps at boot time - Parity error - bad memory

See link below for various Bios and what the beep code can mean for each. I'm pretty sure yours is AMI Bios...

https://forum-en.msi...bios-beep-codes
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#6
Quartz

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I'd be more inclined to think it's a possible power supply problem before a cpu, because it appears nothing is working, although a cpu failure could also cause just about any issue

 

I called the power supply unit a CPU - sorry for the error.  This is the only thing I haven't checked yet.

 What operating system is installed ?   I have a SSD that has Windows 7 & 10 on it for dual booting.  Also, have a 1TB hard drive for all other files. 

 

What is the make an model of the computer ?  The computer was custom built in a Cooler Master case.  It has everything in this link:  https://us.msi.com/Motherboard/A75MAG55

 

In the past, I have always been able to figure out the solution to whatever was wrong with it.  Not so fortunate this time around.

 

I have seen the monitor, keyboard, mouse issue resolved by replacing the CMOS Battery. Darn I was hoping that would work,  

Thanks
Joe :)


Edited by Quartz, 12 July 2019 - 07:15 PM.

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#7
Quartz

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On further research,

Don't rule out the ram just yet..

According to your motherboard it has an AMI Bios.


2 beeps at boot time - Parity error - bad memory

See link below for various Bios and what the beep code can mean for each. I'm pretty sure yours is AMI Bios...

https://forum-en.msi...bios-beep-codes

 

From what I understand, parity error indicates either memory problems or data corruption.  Is this correct?  I haven't tried to boot the computer from a flash drive that has Windows 10 on it.  I assumed the errors have nothing to do with Windows.

 

 


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#8
Quartz

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Since my last post, I changed the CMOS battery again, booted with no Ram, booted with different compatible Ram, & booted with the SSD & hard drive disconnected.  I keep thinking it's likely the MOBO, but I have read more than one online people with same issues figured out a fix & it wasn't their MOBO.  Is there a way I can check the MOBO to see if it's ok?

 


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#9
zep516

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Hello,

When you changed the Ram to a compatible set did you still get 2 Beeps at boot ?
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#10
Quartz

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Hello,

When you changed the Ram to a compatible set did you still get 2 Beeps at boot ?  Yes.

 

Update on latest:  I removed the original Ram (SG.SKILL Ripjaws) & cleaned both with an eraser.  I installed only one & left the drives connected.  When it booted there were no beeps.  I the conected the keyboard in a USB connected to MOBO.  Still didn't work.  I connected the monitor via HDMI on MOBO. Still nothing, so I powered off & restarted.  It ran for 3-4 minutes before the 2 beeps.     

 

Powered off again, inserted the other Ram it took 3-4 minutes again for the 2 beeps.  Originally, the 2 beeps were right away.                                                                 


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#11
Quartz

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I also went over every connection, comparing them with the diagram in the manual.  They were all secure & I didn't anything that looked unusual. 

 

The PSU is:  Antec EarthWatts Green EA-430D Green 430W Continuous power ATX12V v2.3 / EPS 12V 80 PLUS BRONZE Certified Active PFC Power Supply


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#12
zep516

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Hello,

Suspecting a possible motherboard issue I would power up the computer then get a pencil with an eraser or any non conductive instrument and press the area around the ram with a bit of pressure so as to flex the board and see if anything happens.

I'm not sure how to trouble shoot a motherboard... But the above exercise might show a broken or loose connection on the board in an around the ram modules.

Thanks
Joe :)
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#13
Quartz

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Okay.  i will try that.  I can't understand how there no power to the Monitor, keyboard, & mouse, if that's the correct term.  I've never had any of these fail to come on until now.


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#14
zep516

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What kind of computer is this make an model ?

Never mind.....
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#15
zep516

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oops

You already answered that. My bad..
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