Jump to content

Welcome to Geeks to Go - Register now for FREE

Geeks To Go is a helpful hub, where thousands of volunteer geeks quickly serve friendly answers and support. Check out the forums and get free advice from the experts. Register now to gain access to all of our features, it's FREE and only takes one minute. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more.

Create Account How it Works
Photo

Video Mode Not Supported


  • Please log in to reply

#1
Adarx

Adarx

    New Member

  • Member
  • Pip
  • 2 posts
Hello everyone ^^ I'm not sure where to post this, but since it's monitor related I'll put this here.
I've had this computer and monitor for 2 years, and never had any problems with them. Today, however, my computer bugged a bit (couldn't restore a tab on the small horizontal task bar) and decided to restart it. Everything starts fine, I see the BIOS screen and then...everything goes black and "Video Mode Not Supported" shows up. I can't log on my computer normally. It only works in safe mode. I tried changing the resolution there (to 800*600), but I still have the same problem !
I googled this issue but most of the problems come from new monitors, while mine has worked perfectly with my CPU for the last 2 years.
Any help would be greatly appreciated :) Thanks in advance!
  • 0

Advertisements


#2
Digerati

Digerati

    Grumpy Ol' MSgt (Ret.)

  • Retired Staff
  • 3,997 posts
  • MVP
It does not sound like the monitor to me but the best way to ensure, and to isolate the problem to either the computer or the monitor is to swap the monitor with another computer and see if the problem stays with the computer, or moves with the monitor to the new computer.

If the second monitor does the same thing on your computer, start at the wall. We can assume you have power at your wall outlet, so the next step is to make sure the PSU is good. That's easy, but only if you have known good spare, or the correct test equipment. Below is my canned text for testing PSUs.

***

To properly and conclusively test a power supply unit (PSU), it must be tested under various realistic "loads" then analyzed for excessive ripple and other anomalies. This is done by a qualified technician using an oscilloscope or power analyzer - sophisticated (and expensive) electronic test equipment requiring special training to operate, and a basic knowledge of electronics theory to understand the results. Therefore, conclusively testing a power supply is done in properly equipped electronic repair facilities.

Fortunately, there are other options that are almost as good. I keep a FrozenCPU Ultimate PSU Tester in my tool bag when I am "in the field" and don't have a good spare power supply to swap in. While not a certain test, they are better than nothing. The advantage of this model is that it has an LCD readout of the voltage. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within specified ATX Form Factor Standard tolerances. Lesser models use LEDs to indicate the voltage is just within some "range". These are less informative, considerably cheaper, but still useful for detecting PSUs that have already "failed". Newegg has several testers to choose from. All these testers contain a "dummy load" to fool the PSU into thinking it is connected to a motherboard, and therefore allows the PSU to power on, if able, without being attached to a motherboard - great for testing fans, but again, it is not a true load or suitable for conclusive testing.

Swapping in a known good supply is a tried and trued method of troubleshooting, used for years even by pros. If you have access to a suitably sized, spare power supply, carefully remove the suspect supply and replace it with a known good one and see if the problem goes away.

I do not recommend using a multimeter to test power supplies. To do it properly, that is, under a realistic load, the voltages on all the pins must be measured while the PSU is attached to the motherboard and the computer powered on. This requires poking (with some considerable force) two hard and sharp, highly conductive meter probes into the main power connector, deep in the heart of the computer. One tiny slip can destroy the motherboard, and everything plugged into it. It is not worth the risk considering most multimeters, like plug-in testers, do not measure, or reveal any unwanted and potentially disruptive AC components to the DC voltages.

Note the required voltage tolerance ranges:

Posted Image


And remember, anything that plugs into the wall can kill. Do not open the power supply's case unless you are a qualified electronics technician. There are NO user serviceable parts inside a power supply.
  • 0

#3
phillipcorcoran

phillipcorcoran

    Member 1K

  • Member
  • PipPipPipPip
  • 1,293 posts
When you start in 'Safe Mode', Windows loads it's own driver (vga.sys) so any changes you make while that driver is being used are not applied to your existing third-party driver. Hence, when you try to start in Normal Mode the unsupported resolution is still set, so your monitor keeps bringing up the same error.

Bring up the advanced startup options again (F8) but this time instead of choosing 'Safe Mode' choose 'Enable VGA Mode'. This mode will start Windows in 640 x 480 resolution using your existing video driver.

This allows you to set the resolution and the new setting will be applied to your existing driver.

Reboot and your monitor should work now.

Edited by phillipcorcoran, 29 May 2010 - 02:47 PM.

  • 0

#4
Adarx

Adarx

    New Member

  • Topic Starter
  • Member
  • Pip
  • 2 posts

When you start in 'Safe Mode', Windows loads it's own driver (vga.sys) so any changes you make while that driver is being used are not applied to your existing third-party driver. Hence, when you try to start in Normal Mode the unsupported resolution is still set, so your monitor keeps bringing up the same error.

Bring up the advanced startup options again (F8) but this time instead of choosing 'Safe Mode' choose 'Enable VGA Mode'. This mode will start Windows in 640 x 480 resolution using your existing video driver.

This allows you to set the resolution and the new setting will be applied to your existing driver.

Reboot and your monitor should work now.


Thanks for answering :) I tried what suggested, but I still get the same problem going into VGA Mode. The only mode I have access to is Safe Mode :/ Any tips?
  • 0






Similar Topics

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

As Featured On:

Microsoft Yahoo BBC MSN PC Magazine Washington Post HP