Screen not communicating with computer

C

ctlmd

Geek Trainee
My LCD monitor suddenly stopped communicating with my computer, i.e. no blue LED and nothing on screen when I turn computer on. I remounted the video card (ATI Radeon 9600), but still nothing. The monitor works fine on another computer.
I'm running an Athlon 64 3400+ on an MSI Neo-2 motherboard.
Where should I start troubleshooting? or, what's the most likely cause?
 
Try clearing your CMOS, inside there should be a jumper which might be called JBAT1, or simple Clear CMOS, move the jumper over pins 2 and 3, and then back to pins 1 and 2.

Alternatively, take out the little motherboard battery and put it back in.
 
I tried both of the above, moving the jumper in JBAT1 and removing the CMOS battery (and returning them to their original positions), with no improvement in response from the monitor.:(
 
I tried another video card in my computer, and it didn't work either. Then I tried the original video card in my other computer, and it worked. So, it's not the video card.
 
ctlmd said:
I tried another video card in my computer, and it didn't work either. Then I tried the original video card in my other computer, and it worked. So, it's not the video card.
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sorry, i lost your post, thank you for PM ing me, anyway, how is the LCD screen receiving power
  • direct from mains
  • from PSU
if from PSU try using a working cable connected direct to mains

Edit: if direct from mains try using a working cable (and check fuse)
 
The PSU is an L&C Computer Co. Model LC-B400ATX.
I'm not sure where to begin in testing the mobo.
 
well i've never heard of that PSU, but it may be big in the US, check out Big B PSU Sticky but it will be easier to try a decent PSU (like the Antec TP 2) besause i would try replacing the motherboard to test it
 
I looked back further in my records and the PSU is actually listed as Power Up (OEM) 400 Watt dual fan power supply.
 
a 400W OEM PSU is probably not a good PSU, try a good PSU that you know works, then we can eliminate the PSU
 
I checked the connections from the PSU, and re-seated them, and the computer works. Now I can see the screen, but booting is extremely slow, as it has been for awhile, and the BIOS isn't recognizing the SATA hard drive (probably because of clearing the CMOS before), even though it boots fine.
You said that the PSU is probably not adequate for the computer. I guess it would be a good idea to replace it with one on the list of recommended PSU's.
 
I decided to go ahead and upgrade my PSU, as the OEM I have doesn't seem to be adequate or functioning properly. I'm going with a Thermaltake Toughpower 600. I thought of going with the Toughpower 750, but it seemed like more than I need.
 
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