why is it that my pc just restarts without doing anything?
832015
Take it back out and see what happens.
1090584
This could be a cooling issue, check your fans and dust out your system. I saw one system the other day that did this because of the massive amount of dust, even though the fans were still turning. \nAlso try starting the computer in safe mode and see if it works then or locks up without restarting. A bad XP install will cause this sort of action. Sometimes there is a bios option that tells the system to restart on error, you can turn this off to help diagnose the problem.
1071841
Restarts randomly, overheating, increasingly slower speed.  Often times, I've found that a problem that seems to be the CPU ends up being a faulty fan that needs replaced to prevent overheating.
361007
could be a hardware or heat related condition. if the fan for the cpu stops working, the cpu will get too hot and the computer will shut it's self down.
629896
Random reboots/crashes/freezes could be due to several reasons,  including RAM, hardware issues, etc., but rather than waste everyone's time playing "20 question" type guessing games, just do the following and post back with the info so that we can narrow it down some.\n\nGo to control panel/ system / advanced Tab/ startup and recovery box/ settings button/ sytem failure  and uncheck  "restart on system failure" ( take the check out of automatically restart box )   ,   and check the Write a system event, and the Admin alert boxes (check "send admin alert").     This will force a BSOD on the next crash (freezes/restarts =  crashing) that posts the Stop Error Code.     On the next crash write down the exact Stop Error Code and post that exact error  here back on this thread.  \n Also go to your device manager (devmgmt.msc) and check the properties  and look for anything suspicious and check that the settings are where they should be.  \n      \n  Check\n\n1.  Overheating(Open the case and check to see how much dust has collected inside it, and  if there is alot of dust get a can of compressed air and blow the dust out and clean out all dust bunnies, etc. on the heatsink/;fan combo,etc.; and be sure all the fans are spinning and properly functioning )  \n\n2.   Poor power supply   (weak power supply or noisey / dirty electricity) \n\n3.  Bad driver or drivers not updated,  or a device conflict.   Pull the connectors and push them back on. Reseat all of the cards. RightClick - my comp/properties/select the hardware tab/click device manager/see if there are any "!" next to anything.   Try updating the drivers from the manufacturers' websites.\n\n\n4.    Not enough memory or bad Ram.   Missmatched ram or a bad stick of ram  will cause this also.       (Run Memtest86: = http://www.memtest.org and  \n  FREE RAM Diagnostic Tool. -  CST Inc.s DOS based DocMemory  =  http://bucarotechelp.com/computers/default.asp )   .\nYou might need to add more Ram.\n\n5.   Could be  IRQ conflict  \n\n6.  Perhaps the CMOS battery on the motherboard is going bad and needs to be  replaced. Check it to be sure.\nAlso check your pc clock's time and day, to be sure it is set correctly. \n\n7.   Hard drive could be failing.       \n\n8    Right click desktop/properties/screen saver/Power/Hibernate tab ,and make sure  hibernation is not enabled, and cleann out your   Cache & Cookies & Temporary Internet Files and Folder: = http://www.coloarts.state.co.us/cleanFiles.asp\n\n9.   Make sure you have updated all programs and hadrdware.\n\n10.   Motheboard short (loose screw, misplaced mounting standoff ,  etc.) ?\n\n (Note: Will it boot into   Safe Mode?  Hit F8 or F5  right after the BIOS screen to get boot options.  Does it also happen in safe mode?)
270851
This definately sounds like a heat problem. CPU overheats and the box automatically shuts down to keep it from burning out. If the CPU is still too hot that would also prevent you from restarting right away. It could also be the power suplly, but I don't know of any that have a connector so the motherboard con monitor it's heat. They may monitor themselves though, not sure. Next time you start it up, go into your bios and find a setting named something like "PC health" or "hardware monitor" depending on the bios version, and it should tell you there what the temp of your CPU is. Watch it for a while and see how hot it gets. How much heat a CPU can take depends on it's model, but around 70c is edging towards dangerously hot. If this is the case, you'll either need a new CPU fan, or the CPU fan is installed incorrectly. If you do need to replace it, or reseat it, do NOT forget to put thermal grease between the CPU and fan. It's an easy mistake to make if you're a begginer and it will fry your CPU. Either way, good luck to you.
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.
167305
i was currently experiencing the same problem and i restarted my computer and it started working again, so try rebooting:)
967498
If all else fails do a system restore and set it back to a time your PC was working OK, you'll find it in "start" "control panel " "performance and maintenance" Right side panel "system restore"
589787
Read up on this forum at this link and it might help you with your problem. \n\nhttp://www.techsupportforum.com/video-cards/57359-radeon-9200-restarts-computer.html#post282502
1020654
My Computer \nProperties \nAdvanced \nStart Up and Recovery \n-Settings button. \nuncheck "Restart on System failure"\n\nThis will mean that you get a BSOD with an error code - which help identify the cause of the problem
1035156
While tyring to restart hit the F8 key repeatedly and see if it will throw you into safe mode then choose you method to restart from the menu
69454
If you have some kind of antivirus or antispy software. I would suggest you run a scan. You could have something corrupting your pc. If you don't have protection, i suggest you get some.
351642
1. It could be in Hybernate: try to turn off all power and restart the whole thing from the no-power stage.\n\n2. graphic-card / video setting: \n2.1 there's nothing much you can do if you cant see it but i suggest to turn it all off from the no-power stage and press <del> to go to your BIOS setting. Check if you can mannually overide the settings to a lower mode. If so, try restarting again.\n2.2 from the background, the laptop is starting up with windows but u cant see anything coz the video just might have been toggled with. try pressing <F8> by the time you boot it up, chances are u might be lucky enough to go on safe mode and u can level your video setting to a lower degree.\n\n3. if 1 and 2 doesn't work - i damn hope you have backed up you files coz you have to bring it to a DELL shop\n\nHope I helped you out- coz i had that prob once and # 2 did the trick for me
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.
931962
I agree with Hot hondagirl, some programs require a restart post donwload before they work properly.  But you may have something else going on.  I would, just to be thorough, check your PC for spyware adware and viruses.  Free tools can be found at www.download.com\nI suggest spybot search and destroy, adaware personal Se b Lavasoft, and spyware blaster from java cool software.\n\nAnd if you have recently reformated or made any major changes to your PC, I would suggest getting the latest updates for your OS or running a repair.  Or check your browser install, maybe you need to update that or reinstall.
104419
Try restarting your computer.