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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Your computer might emit a series of beeps
during start-up if the monitor cannot display
errors or problems. The following repetitive
beep codes help you troubleshoot problems
with your computer.
NOTE: To replace parts, see the Service
Manual on the Dell Support website at
One beep - BIOS ROM checksum failure;
possible motherboard failure
Contact Dell (see "Contacting Dell" on page 53).
Two beeps - No RAM detected
Remove the memory modules, reinstall
one module and restart the computer. If
the computer starts normally, reinstall anadditional module. Continue until you have
identified a faulty module or reinstalled all
modules without an error.
If available, install memory modules of the
same type in your computer.
Three beeps - Possible motherboard failure
Contact Dell (see "Contacting Dell' on page 53).
Four beeps - RAM read/write failure
Ensure that no special memory module/
memory connector placement requirements
exist (see the Service Manual on the Dell
Support website at support.dell.com).
Verify that the memory modules that you are
installing are compatible with your computer.
Five beeps - Real Time Clock failure
Replace the battery.
Six beeps - Video BIOS test failure
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.
Here is a link to your computer's service manual: ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_xps_desktop/xps-400_Service%20Manual_en-us.pdf There is a section on Advanced trouble shooting which details Beep codes and LED diagnostic codes.
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.
If it is a steady once-per-second beep - or a constant screech - and it is able to boot to the OS (or even most the way), then it is probably your RAID controller. Boot to CTRL-A or CTRL-M to check the status of your array.
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,