An infection could cause the issues your having. I recommend letting a professional help you clean your system. Removing infections is very dangerous and risky. They can cause data loss and you risk making the system worse. I recommend NickLockard.com
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Is your computer reacting slowly when it starts up and shuts down? The cause of this is likely due to the fact that many people have an enormous amount of programs that launch when Windows starts up. Hence when you boot into the Operating System, Windows wants to load each program while you just want to do something else.
The same goes when trying to shut down your computer. Windows needs to close all open programs and services in order to shut down. The less you have running, the quicker it is to start up and shut down. Additionally, you may also notice a sharp increase in your computer's performance since it won't be using as much of the computer's resources with all those background processes running.
If you have a ton of programs that are loading during startup, it's very easy to disable these. This won't uninstall that program, it just won't start at the same time as Windows. It will still be on your hard drive and ready to work when you want to open it.
To stop these programs from starting up with Windows, simply click on Start, type in MSCONFIG, then hit Enter. Remove the check mark next to Load Startup Items and then reboot. That's all there is to it.
Computers are often slowed down on boot because of programs that are starting and running in the background.
To shut prevent these unneeded programs from starting go to:
Select the startup tab and uncheck programs that you do not use. Make sure you do not uncheck any antivirus programs or operating system utilities (you can tell the the manufacturer that is listed and their location, if it has a location such as the windows folder don't uncheck it).
After selecting apply you will be asked if you want to restart your computer, select yes. Upon startup you will be told that you made some modifications. Check the box to never inform you again and click ok.
Processors are what they are. They run at the speed that is selected. In your bios you can change the automatic settings and speed it up or slow it down but if you've done nothing to change this then it should be the same speed as it was when you bought the computer. I will say that if you're running XP then your computer probably has slowed down considerably since it was new. As they add more and more service packs and security updates windows seems to bog down more and more. Also as you install programs on your computer, they all think that they are the most important software on your computer and should start automatically every time windows starts. If you do nothing to stop them then you have more and more programs running at windows startup using up more and more computer resources. If you're adept at computers then you can fix this by clicking on run and typing "msconfig" and disabling some of these programs under the "startup" tab. BE WARE!! Some of these programs are needed and you can mess your computer up bad if you disable a bunch of stuff you're not suppose to.
try to remove the motherboard from the casing and see it if the have
some capacitors or any circuit distroy. use other mother board for
testing chek your hardware one by one maybe some of your hardware
For every piece of software besides windows that starts when you power on your computer, some of the computer performance is sacraficed. this will cause the computer to hesitate , perhaps show a blank or black screen a little longer as the computer starts or comes out of hibernation.
Most of the software you install will have a little box stating something like "start when windows starts" that is checked by default when you install it. always pay attention and read as all of these will slow down your computer if running at startup.
hit CTRL+ALT+DEL once your computer is fully started, this will open your task manager.
select the PROCESSES tab and count or go to the bottom and see how many processes are running right when you start the computer.
Most of these can be turned off, windows only needs about 20 to run efficiently wiuth networking, granted there will be some for the printer also.
write down what you see and and programs that dont need to be running can be set , either in thier preferences or windows settings to not run , thus speeding up the computer..
please post here again after you have checked this and i will assist you if you have more questions.
Many computers have way too many things running in the background. If you see more than three or four little icons down just to the left of the clock, (this area is called the System Tray), some of these programs could be causing your problems.
Use Windows Explorer and navigate to:
Adjust the size of your Windows Explorer so you can see some of your desktop and drag everything in the Startup folder out on the desktop, and then restart your computer. If this minimizes, or eliminates your problem, put each item back in the Startup folder, one-at-a-time, and restart and re-test your computer until you locate the offending program.
If your computer shut off but the power keep on means that your computer is in hibernate mode To avoid that, do this:
Go to Start >> Control Panel >> Power Options
Unckeck the hibernatge mode at hiberbate tab.
This will fix your problem.
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1) what is the wattage of your power supply, it could be that it is not enough for when your system is running under a heavy load. Or it could just be failing fast.
2) check fans and temperature, systems will shut down to protect themselves if it gets too hot.
3) look at the mother board, are any of the capacitors leaking or bulging, if so you mother needs replacing unless you are comfortable replacing capacitors.
is there a post beep when the pc is switched on. check the memory if it is a beep beep beep sound , also disconect the hard drive, dvd drive, floppy, and any usb devices and see if it boots up. if that fails it does seem like the mother board, also check the cpu fan has it stoped. also find out the power switch conector on the mother board, from the base unit switch to the mother board. also chech the power connector from the power supply to the mother board , on newer boards there are two that go to the mother board its self , a big one and a very small one .