Well in the system Bios or setup there are options where you can have the computer turn itself on automatically at a certain time. However, the fact that yours is turning itself on and off seems to indicate that it is either over heating or it is running into an issue when trying to boot and it keeps recycling the boot process. There is an option that you can set that will turn off automatic restart on boot. Turn off the computer and then turn it on and start hitting F8 repeatedly until you see Safe Mode as an option. Scroll down through the options and you will probably see an option that lets you stop automatic restart on boot, and take it if it is there. This will allow you to actually see the error message that is causing your computer to reboot itself.
SOURCE: Dell 5000 Dimension starting issue
You need to change your power save options. Right click on the desktop, click properties, click tab screensaver click on power tab. set the desired power save functions. hope this helps
SOURCE: Power supply in Dell 5150 making grinding noise sometimes
Hello,
Best case scenario is that you just have something stuck in the power supply fan. But, yes, the power supply could have a cracked bearing. Unfortunately, this is a fairly common occurrence. General grade power supplies have had marginal quality construction for as long as I can remember building systems.
I would suggest just replacing the power supply if it continues to make noise simply because a faulty one can cause you all sorts of problems down the line.
Sorry I can't offer any more practical advice, but hope my $.02 helps!
Jeff
SOURCE: my dell vostro turns off randomly after one hour or more of idel
hi frnd..
Go to control panel.. select the power options.. set all the option in POWER SCHEMES to NEVER... this will fix the issue...take care
SOURCE: Dell Vostro 200 PC freezes randomly.
Try doing a system restore. back it up a few months and try that.
SOURCE: Dell Optiplex 740 Desktop Desktop Computer i
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
A solid amber power LED indicates a problem with the motherboard, or something attached to it. (I've seen a bad mouse cause a no post before) Disconnect all cables except power, turn on system see if any LED change. If using a UPS, connect power direct to the wall. If still no change, open case, remove any expansion cards, try again. If still no go, disconnect power cables to all drives, try again.
If still no change, then replace the motherboard
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