When I turn on my Dell XPS 600 I hear 6 beeps from the computer and no signal to the monitor. This comes after it recently has been rebooting randomly whether I'm actively using the machine or letting it idle with processes such as Firefox running.
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sounds like youv'e covered all the possibles i would. could be the boot files got corrupted or the monitor is bad(have you checked it with another pc?) check the motherboard for swollen capacitors(those barrell looking objects randomly scattered over board. if the tops that have little crosses on them (+) are popping up/out unlike others, then your board needs replacement or new pc. cannot fix those. happened to a friend of mine. would not boot up to show windows.
If I understand your issue, it sounds like the display works fine until it loads Windows, and then it has the error? It sounds to me like the video card drivers are crashing. This may be the case if you have recently updated them, or installed a new video card. I would recommend getting the latest drivers from the manufacturer's website on a CD, SD card, or USB drive, and then boot your computer in safe mode. Once in safe mode, install the new drivers, and see if that will help. You could also try using your onboard (integrated) video card if your motherboard has one. This could help rule out if the monitor is at fault. Just make sure your BIOS has the integrated card as a secondary video device if it the (I'm assuming PCIex16) peripheral card isn't found.
there are 2 things that can cause that, memory failure, or mother board, cheeper route to go would be replace your memory first, and see if that corrects the problem, if not then, check anything new you installed inside such as video card, lan cards, of something like that, if that doesn't work you need to have it looked at and possibly the mother board replaced,
So, when the monitor is on, connected to the wall (not to the computer), there's absolutely no signal? no message on the screen? no colors moving? Have you tried with another power cable? You can try this test. Use the computer's cable to test if the problem is the monitor's cable.
Possible reasons for random rebooting: 1. CPU Fan/Heatsink is loose Restarting due to Overheat Prevention. Im guessing the processor is LGA775. if u can open up the case and see if any of the four plugs and sockets has come loose, then that might be it.
2. Not Enougth power from PSU (Power Supply Unit). if it was built for gaming im explecting a PSU of at least 750Watts
3. Harware malfunction. When booting up, any error beeps?
4. Software error. Before logging in a user account, leave the computer on for a while if nothing happens then most likely be OS problem.