System freezes don't know cause, occasionally won't boot into windows
Dell Dimension 4600 seems to have a problem that I am unable to identify. The system occasionally fails to boot into windows leaving me with just a blinking cursor in the top left corner of the screen. Other time the system will boot and run for an unpredictable period of time, usually not for more than a few hours and will freeze up, not ever recovering. When it does this the only thing that works for any purpose is to press the power button and hold until a force shutdown occurs. This returns to the initial issue of the system possibly failing to boot windows.
This system has been upgraded slightly, currently running 3GB of RAM and a GeForce 6200 graphics card. Everything else is still original.
I am starting to think that one of the components in the system is starting to die. That being said I don't know where to start to identify which component that it may be. I would like to be able to continue using this system rather than have to get a new computer because a new computer isn't in my budget right now and from what I can find replacement parts for this one are fairly in-expensive. Any assistance would be greatly appreciated.