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Computer troubleshooting thread.

post #1 of 14
Thread Starter 
I see this problem being posted everyday on ocn. My guide and This should help you determine the problem.


No signal problems

How many of you have gotten "No signal" on the monitor and don't know what the problem is?

First try these methods brought up by Jacks Smirking Revenge

Quote:
1) Kind of obvious) Switch all off and try again.
Switch off the power at the PSU (switch on back), then hold down the ATX switch (on button on the front of the case) for 30 seconds to clear residual charge in capacitors. Switch back on. - If this worked you really didn't need this FAQ...

2) Ensure that ALL cables are tight, pay special attention to the dongle going to the GFX card (if applicable).
Also make sure that your monitor is actually plugged in to your GFX card...

3) Reseat the GFX card, take it out, check for obvious signs of damage, you may want to clean the gold contacts with alcohol or meths.
Put a small amount on a "lint-free" tissue, or use coffee filters.
Put it back in. Make sure it's all the way in and nice and tight.
You should just be able to see the very tops of the gold contacts sticking out of the socket. Make sure that there's nothing obstructing it - e.g. open RAM clips on the motherboard.
If there are any clips to lock it down make sure they are tight.

4) Clear the CMOS.
The CMOS battery provides charge when there is no power at all going to your motherboard; this charge keeps the adjustable settings of your BIOS set. Clearing these settings resets you BIOS.

If you have one, use the clear CMOS jumper located near the battery on your motherboard. Get exact details in your motherboard manual, but basically it's three pins, with a jumper over two of them
[◘ ◘]◘
With power switched off as in step 1, move the jumper to short the other pin
◘[◘ ◘]
leave for about 5seconds then put back, switch power back on.

If you do not have a clear CMOS jumper, remove the CMOS battery. The battery's a pretty easy thing to spot. It looks like a watch battery... To remove it, look for the little clip holding it down towards one edge, push it back so that the battery "pops up" (Tooth-pick is a useful tool for this - Do not use a screwdriver or force the battery in anyway.). Once it's out, place it on a nonconductive, clean, and surface. Try to hold the battery by the edges if possible.
Leave for about 30 minutes then put back in. Switch on.

If you're still getting "no-signal" at this point then you may have more serious problems.

5) Last-resort, but oddly the most common cause - imho) Thermal Paste. Thermal paste forms a thin layer connecting the Heatsink to the processor. Both the heat spreader on the CPU (the metal bit) and the Base of the Heatsink have tiny grooves in them; the thermal paste fills these grooves and provides a Larger S.A. of contact between the CPU and Heatsink, thus increasing thermal conductivity.
If the Heatsink moves even the slightest amount, it can break this bond, losing that critical thermal advantage. And causing the CPU to shut down instantly on startup.
This is particularly common if your thermal paste is old or thinly applied. Newer and a higher quantity of thermal paste is more mobile, allowing more Heatsink movement. As it adapts to fill those grooves.
If it didn't help try these other methods:

1.) Turn the PC and monitor off. Turn the PC on, then wait 15 seconds(or until the beeps stop) and turn the monitor on. Try this process 5 times before going to step 2.

2.) Turn the switch at the back of your PSU to off mode. Unplug the DVI cable or VGA cable from the graphics card. Apply canned air on the DVI port and the pins on the cable. Dust can be trapped in these areas and cause connection problems.

3.) Turn the switch at the back of your PSU to off mode. Take out all your ram dimms expect for one. Boot up the PC. If there is still no signal, use a different dimm. Kepp switching until you have used all of them.

4.) Try to use a different DVI cable.

5.) Test the computer at a friends house.

If all else fails, proceed to troubleshooting the problem.




Computer Troubleshooting






























Note: I did not make these flow charts. I simply found them on the internet.

source

If I had made any sort of spelling.grammical error, please let me know and I'll fix it asap.

If you know other methods to fix this problem, post it here, and I'll add it to the list.
Edited by Refresh - 6/7/08 at 9:27am
post #2 of 14
Nice guide, and good flow charts, +rep
Waka waka waka
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Waka waka waka
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom X4 II 955 BE @ 3.84GHz Biostar TA790GX A3+ Powercolor 5770 1GB (935/1280) Patriot 2gb DDR3 1333mhz 
Hard DriveOSMonitorKeyboard
WD 500GB SATA Win7 Ultimate 32-bit Acer H233H IBM Model M 
PowerCaseMouse
Coolermaster 550w Mozart TX Razer Deathadder 1800dpi 
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Reply
post #3 of 14
Nice job, put alot of effort into that obviously, but really. Do you really think noobs will actually look at this?


...not a chance.


Rep+
post #4 of 14
Thread Starter 
Quote:
Originally Posted by Penicilyn View Post
Nice job, put alot of effort into that obviously, but really. Do you really think noobs will actually look at this?


...not a chance.


Rep+
Thanks for the comment.

At least its worth a try
post #5 of 14
Thread Starter 
Added 4 more flowcharts
post #6 of 14
nice job, rep +!
E4500
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E4500
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E4500 XFX nForce 680i LT SLI EVGA GTX 470 4x1G OCZ Gold XTC 
Hard DriveOptical DriveOSMonitor
Western Digital 1TB LG DVD-RW Windows 7 Home 64-Bit Samsung Sync Master2343 
PowerCase
ULTRA LSP750 750-Watt CoolerMaster Centurion 
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by Ron.L View Post
nice job, rep +!
Thanks
post #8 of 14
Thread Starter 
Do you think this thread should be stickied?

Also, 85 views and only 3 replies? I thougth most people would appreciate this
post #9 of 14
having troubles now with my 22inch lcd. it gives the no signal message while in use not at startup. this is what i tried:
clean and resocket card
inspected for damage
tried another pci-e card
tried another monitor
tried another cable
tried earlier restore point
tried removing and reinstalling drivers<both card and monitor>
i have not tried to use the slot#2 on the MB as i dont know if you can do this without running SLI.
I have not tried the cmos reset as of this post but i will as soon as i get a reply to this one.

symptoms are: Random no signal failures. It may be 30min into a session or 6 hours. It totally varies
post #10 of 14
Thread Starter 
I hope your problem got resolved mudronin
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