memory behaving weird

I left the PC on for about 30 minutes for it to process something, when I came back I found it turned off. From since it does not want to boot, but it does show that it has power by the lights when I turn on the switch. Even the CD-ROM drive can open and close. I reseat the memory several times and it does not work. I even reseat the CPU, and nothing. Then I borrow my friend's memory and insert it into the PC. It worked! It went into Windows and all. Then I decided to put back in my memory. Well, while I was surprized to it's reaction I say to my self "what do you know". The PC is back up.

What I want to know is what's causing it that it does not want to work until I plug in and out another memory into the system.

Thank you expert
Yien Tsai
TsaiAsked:
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CallandorConnect With a Mentor Commented:
Try cleaning the contacts with an eraser - that might be the reason taking memory out and putting it back in would cause it to work.
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CallandorCommented:
Are you sure you don't have a BIOS setting that says your system should sleep after a given amount of time?  It may not have been the other memory, but shutting down the machine and starting it up again.
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TsaiAuthor Commented:
Sorry that I didn't reply sooner. I was on vacation from my work and I had no access to internet.

Even if it was the BIOS' power saving function, it should come back on when I press the power button of the PC. I even make sure that I turn it off by unplugging the power cord. Then I plug it back in and press the power button, but it just didn't want to start. All I see are the lights and the CD-ROM that can open and close. Nothing on the screen until I put in another memory.
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CallandorCommented:
That certainly doesn't make sense - there could have been some other component failing, like your power supply, combined with a surge or voltage drop in your house.  Putting in a memory from somewhere else when your memory had nothing wrong with it should not have caused a non-working system to work.  Having other simultaneous problems that you didn't know about seems more reasonable to me.
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TsaiAuthor Commented:
But the thing is, I didn't test anything else, but just played around with the CPU and the memory. I didn't even touch the power supply connections.

Now the PC works but now and again, it freezes, and then when I restart it refuses to come back on. I had to do the same thing, reseat the memory. Only this time I don't have to borrow the other memory.
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TsaiAuthor Commented:
I will try that. Sorry for holding you for so long.

Thanks for your time.

Yien
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