Windows XP keeps on rebooting after 5 minutes of Windows startup

Good Morning, I have Windows XP Professional, it keeps on rebooting by itself without logging off(crashing but without blue screen) and afterwards it gets into Windows XP again, Microsoft would ask me if I would like to send a serious error report and when I click send, it would say that it is either of the components: Motherboard, CPU, RAM, Power Supply are failing and need to be replaced.  How would I know which one is causing the crash and How woul I test each one of them if they are really failing? Thank you very much
1) Motherboard?
2) RAM?
3) CPU?
4) Power Supply?
5) Hard Drive?
6) Maybe Video Card?
Thank you very much.

*I installed additional 256mb PC2700 of RAM(by Elixir) on Monday and on Monday and Tuesday, it never crashed only on Wednesday night that it keep on rebooting. this info might be helpful
toptop777Asked:
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toptop777Author Commented:
Also, I started encountering crashing(rebooting by itself) when I run Spybot program on Safe Mode.
MarkCommented:
It still may be blue screening as there is a setting in the system properties
Click -->START-->CONTROL PANEL-->SYSTEM
In here click on the -->ADVANCED tab then the SETTINGS button in the startup and recovery section. Uncheck the -->AUTOMATICALLY RESTART temsys

This will stop the computer from restarting when a BSOD restarts the system
toptop777Author Commented:
Mirosoft Crash Analysis Report is telling me that one of the components need to be replaced. What do you think is failing? What mus be causing this?
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CallandorCommented:
You won't be able to tell without doing some experimentation.  Ideally, you use replacement parts that you can substitute and isolate the problem.  Otherwise, go through to the most probable and start with substituting RAM.

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toptop777Author Commented:
Do PC's have like Apple hardware test in PC version?
CallandorCommented:
Only a quick RAM test that is not at all thorough.
toptop777Author Commented:
I will go home and try this first: It still may be blue screening as there is a setting in the system properties
Click -->START-->CONTROL PANEL-->SYSTEM
In here click on the -->ADVANCED tab then the SETTINGS button in the startup and recovery section. Uncheck the -->AUTOMATICALLY RESTART temsys

This will stop the computer from restarting when a BSOD restarts the system


Then try RAM test as suggested by Callandor. I will update you guys..
CallandorCommented:
If you don't have spare working RAM (the best way), run the memory diagnostic program at www.memtest.org.
leeringmonkeyCommented:
I always thought the Blue screen was a memory problem?
You said you added a stick of memory, after you remove the stick do you still have the problem?
What are the other modules? Brand size>>>>>
It sounds like the whole problem is a ram issue. Check here first before trying to trouble shoot cpu, hard drive >>>>>
toptop777Author Commented:
by Elixir, it is 256mb, now I could not boot to the desktop.
toptop777Author Commented:
it is just hanging in the welcome screen with blu bacground and welcome Windows XP with logo and you could move the mouse but it is just there in the Welcome Screen.
MarkCommented:
So it isn't restarting now just stopped at the welcome screen and won't go past it? Try starting in safe mode, press f8 when the post messages are finished and before the welcome screen appears.
Right now how many sticks of ram are installed. Try one stick at a time, and each time change ram slots until it starts up in a stable condition.
toptop777Author Commented:
It was indeed the faulty RAM I installed, Callandor had it first and deserve all the points, Thanks again guys.
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