Helping people with computers... one answer at a time.
Windows has stopped sending a signal to your monitor. It's probably crashing randomly. I explore what that means.
Leo, I have an intermittent problem. Sometimes when I boot up, my screen will show the Windows 7 flag for a bit and then all of the sudden, I get the "No signal" message on my monitor and the video is gone. As I said, it is intermittent. It may happen once every few days or may go as long as three weeks and then it rears its ugly head. Any ideas you can give me would be appreciated. Thank you.
In this excerpt from Answercast #36, I look at a system that is hanging and not sending a signal to the monitor. Time for some troubleshooting.
All that really means is that Windows on your computer has stopped sending a signal to your monitor.
It just means that the system (in your case, during the boot process) has, for some reason, failed to boot and crashed completely. The machine has become hung in such a way that the video card is no longer attempting to send anything to the monitor.
Now, as to why that might be happening? Gosh, you got me!
It could be so many different reasons, particularly when it's intermittent like this; it can be very, very difficult to diagnose.
My recommendation would be that you begin, of course, by backing up.
The fact that it is working intermittently (or working more often than not) could change. This is a sign that there is something wrong and you do run the risk, at some point, of the computer not booting at all.
So the very first thing you should do is make sure that you're backing up and backing up regularly.
That aside, then I would start looking at things like overheating.
Make sure that the computer has enough ventilation.
That it's not full of dust (a very common thing that happens to computers that have been around for a while.)
Make sure that all of the monitor cables are connected properly.
If you're so inclined, one of the other things that sometimes helps is to unplug the computer from your power. Open it up and basically reseat all of the cards, all of the removable cards – the expansion card, the memory cards, and so forth.
Make sure you're well grounded; that there's no opportunity for static to damage anything. This is sometimes something that people have found to be helpful – some of the connections may be intermittent and it may be as simple as that causing your problem.
I would run a RAM diagnostic after the machine is running again. Just to make sure that all of your RAM is operating properly.
The problem with RAM is that a single bad bit in RAM can sometimes manifest in these completely random ways.
Outside of that, it starts to get really difficult to nail down. It might be time to pull in a technician to see if they have any additional ideas.
But, those are the kinds of things I would have you do, at least to start to diagnose this problem.
Next from Answercast 36 – If deleted files remain in the recycle bin has any disk space been freed?
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