My pc had been turned on for about 25 mins, I was gaming (not very system intensive) and the pc shutdown instantly, the monitor retained power so not a spike. System tried to rebbot itself but re-shut down half way through boot process, it tried to reboot again, only this time it only managed about 7 secs of boot process. This repeated itself about 5 times with the mount of time the pc booted for reducing each time until it does not boot at all. I still have a light come on at the on button but have nothing happen when switched on (no fans, drives, operable)
What has broken?
My system specs are:Win xp - sp3, 650W atx psu, e6600 duo processor and motherboard(pd5k asus i believe?? came with the pc), 9800gt g/card, 2x sata hd drives, 1x optical drive, 3gb ram. I installed ram, g/card and psu about 2 months ago and all has been very well till now.
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make sure the cables have not come loose, then turn the monitor off then back on, if that doesn't work is where the fun starts. boot up to safe mode with networking. If that loads up and the screen is still black then either your monitor or video card need replaced. Hook up a different monitor if that works it is naturally your monitor, if not then it is your video card. Unless you are into high end graphics design, gaming, or hooking up to a flat screen tv, they are not too too expensive and can be swapped out in a matter of minutes
First reboot your computer in safemode by powering it down, turning it back on, and pressing F8 as it boots up. This will allow you to lower your resolution back to an acceptable level so you can shutdown and reboot again normally.
As far as the automatic changes in resolution, the problem is typically with the game itself and not your pc or monitor. I have experienced this with certain games and all other games worked well before and after the problem with the specific game. The actual game you were playing when it happened would help narrow it down if you wish to post it. Hope this helps.
If the activity light on the front of the tower is not glowing than it can be an issue with the power supply of the PC. Try to open the tower and try to reseat the Power supply cables and check.
You can also try to Reseat the RAM (memory) sticks. If you have 2 Memory stick you can just try to boot the pc with the help of one stick and vice versa. If still the issue persist you can try to do a test on the Motherboard. Simply take out the Memory cards and power on the pc . if you hear a beeping noise than the Motherboard is fine and if you dont hear a beeping noise that it is a faulty Motherboard.
you need to open up the case, and remove the CMOS battery ( a silver wafer-style battery about the size of a quarter) and leave it out for about 10 minutes. put the battery back in and close the case back up and DONT mess with ANYTHING ELSE. if the computer STILL wont boot, then your motherboard is bad, and will need to be replaced through the manufacturer of your PC.