Black Screen On Bootup

Hello, I have been having this problem off and on for about 2weeks here are my PC specs

700mhz Duron
x1 128meg 100mhz SDRAM Compaq Generic Ram
x1 128meg 133mhz SDRAM Crucial
40gig Seagate 7,200 RPM 100 ATA Harddrive 2months Old
Geforce 2 Titanium 64meg DDR AGP4x Card 1yr Old
Gigabyte GA-7IXE4 Motherboard

My problem is 75% of the time when I bootup My screen wont turn on, or when I am on the PC about 2-5mins into it running the Screen will go black, I no its not the monitor because I tryed using a brandnew monitor with the PC and the exact thing will happen, the tricky thing about this problem is that if I take out the memory and mix up what slots they are in or take out one and just leave in one, the pc will boot and I can use it, sometimes not, I dont think its my graphics card cause it doesnt get hot, and its only a year old, and sometimes the PC will bootup and then the screen will go black and ill get the monitor will display Unrecognizable Frequency this is rarely though. As I am typing this the pc has been running for about 10 mins and hasnt blacked out on me, I also dont think this is a Graphics Card problem cause once when it blacked out and I was listening to an MP3 the song stopped and kept repeating the last second over and over, I also dont believe that the processor is the problem because of the Ram Swaps work to turn it back on most of the time, and also the processor never gets hot, and even if I leave the computer off for a day in a cold room it still wont turn on, but if i swap the memory slots it will, I am stumped, I dont understand how it can work one day for long periods of time over 20hrs and next day wont work for 5mins at a time if at all. Any help or direction would be most welcome thx much.

 

This sounds like a graphics problem. Even if the card doesn't get hot, it can still be damaged. I suggest try a different video card, and see if the problem still happens. Also, I see that you have 133 and 100 ram mixed in. This could contribute to the problem, but I doubt it. Leave in one stick of ram for a while and see if the problem happens. Then swap it with the other one. You gotta try everything. If you have onboard video, try it with that.

 

I have done the swapping thing many times, right now it has been running for about 12hrs with both sticks in, I still need to swap graphics cards but I dont see how it can work for so long and then not work for 5mins.

 

about 13hrs of it running and the screen went black, took out a ram stick and left the other in without removing graphics card rebooted and it worked, please any information on this would help.