My desktop computer reboots for no known reason. I have replaced most of the internal parts, What is wrong?
604552
First, you should turn off your Automatic Restart feature.  To do this, you must go to Start, Control Panel, System, System Properties, Advanced Tab, StartUp and Recovery button, and uncheck Automatically restart under System Failure.  What will happen instead of restart is a blue screen.  On that blue screen, there will be stop codes.  Write these down.  Then using a computer that works, enter them in google or go to Microsoft and find the place where you can search for these codes [google will probably be faster].\n\nBy and large, I think there is a problem with heat, probably your cpu.  You should get a can of air and blow out as much dirt and dust as you can.  You may have to remove the fan and clean the fan blades, and that will make it easier to clean the heat sink fins.\n\nBut this is not a sure thing - it acts like it, but getting the stop codes is important as it could be a memory module problem also.  And it could be a software thing, but I don't think so.
867880
I would guess the power supply failed.\nIf the hard drive spins up and you can tell it is booting up you may have a bad video card or a bad monitor.
1086786
Somethings to do will be;\n\nOpen the computer and check all cables and connections\nRemove the CMOS battery to reset the Bios\nDisconnect any hardware that you don't need to boot up\nTake the Ram out and then put it back in\n\nIf none of this helps then it is either a power supply problem or the CPU is blown and the only way to find out which one is to remove it and test it with a working one.
859259
Two things I would first check, \n1. Make sure the reset button is not stuck.\n2. Make sure your BIOS does not have the "Wake on LAN" feature turn on, especially if you have DSL, or Cable Internet.
636654
Because you have already checked if anything was overheating.\nI would check if the ram.\n\nIf you have two sticks of ram installed try booting with just one. Of course test both of them.
420494
sounds like you need to compleatly redo you computer. use the startup diskes that came with your computer. or get a new computer
496977
After you have tried the last suggestion you might want to try this:\n\nRemove any CD/DVD's and floppies also any USB devices then re-boot, if you are still getting the same problem re-boot again but when the PC is starting up (after the initial beep at the BIOS check at start) just keep tapping the F8 function key about once per second you will then be presented with a menu, one of its options will be to start in Safe Mode, select this and see if the PC will start into XP for you, if it does then it most likely means that you have an updated or corrupt driver that is causing the problem and you will need to do some detective work to find out what it is.\nIf you still can't get in to Windows then things are more severe, if you have a Boot Floppy and have an Anti-Virus scanner then check for infections.\n\nThere is a WARNING! I should give you here before you do anything else, if your PC has data that you have not backed up and is important to you or other users of the PC, then DO NOT do anything more, as without proper knowledge of what to do next you can LOSE ALL data, get the PC to someone qualified to repair it.
960713
Can you add a little more info?\n\nIs D a CD&#92;DVD drive? Another partition on your hard drive partition?  Another hard drive itself?\n\nAs cliched as it sounds, if you are running a Windows system, rebooting may repair.
1022693
Reboot your computer. this is a commen problam.
1120466
This is most likely a hardware issue.  Have you installed any new hardware recently (right before the problem started)?\n\nPossible solutions:\nCheck for new drivers for your motherboard.\nCheck for new drivers for your video card.\nCheck for BIOS upgrades.\nIf you bought your computer from an OEM (e.g. Dell, Gateway, etc.), try going to the vendor's website and see if they released any new driver packages.
574311
Right click on my computer, select properties, advanced, startup and recovery settings and uncheck d box of automatic restart.\nIt will solve ur restart problem.
472092
are you powering up with your battery alone, or are you plugged into an outlet?\n\nhow old is your computer? is it worth spending money to fix it by going to a computer repair shop?  are your files very valuable?
223323
You may be wanting to boot into safe mode. That would be F8- or if you want the start up menu options, press F5. Either one must be pressed just seconds (3-5) after the first splash screen appears. CTRL/ALT/DEL IS the standard keyboard combination to reboot. You may just need to turn off the power , then after about 20 secs. turn on again. Use the safe mode F8 as mentioned above. This will allow Windows to boot w/o other software interfering, so you can determine if "other" software has been causing a problem.Perhaps a bad driver (video)?
963631
Random reboots are a tell tale signature of a failing power supply, in other words, your power supply is failing.  I know this through experience, because its happened to me, and through exhaustive web searching.
112486
It could be many things.... start by disconnecting  your Hard Drive... if it still restarts and does not let you stay in the bios try a new Power Supply... if persist its most likely your motherboard... make sure to disconnect  everything else...
481631
Could be that your CPU fan is not running or dirty, the CPU is over heating and causing the PC to reboot.\n\nYour Hard Drive is about too die.\n\nA sticking key on your keyboard.\n\nBad BIOS .\n\nGood luck, caned air and a vac helps your PC stay cool.\n\nOther then that I would run disk check and de frag.\n\nAlso in my old place this guys CB radio used to make my PC reboot.\n\nOk how abou a grounded out USB, that will do it, unplug any USB things you have and see it it does it.\n\nAlso make sure the USB female slots are not grounded to the case.\n\nA screw can be wedged between the Mother Board and the case.
628770
couple of ways to see if it is a hardware or a software fault\n\nfirstly boot into safe mode - restart your pc and keep on tapping the f5 or f8 key then select safemode\n\nleave it in this mode for a while - does it shut down ?\n\ncheck your event viewer for any system errors (in the control panel - administrative - then event viewer) click on the system \n\nsee if this gives you any clues\n\nalso try getting into the bios or cmos setup - again leave it in this mode - does it shut down - if so then you definately have a overheating problem\n\nalso check you in you bios to see if you have a hardware monitor option - if so check the cpu, system temp and fan speeds\n\ncome back to us with your results