Ok, I just tried changing the RAM in a pc running windows 98 but when I reconnected the power cord and screen, etc. the computer would not start up although the fan would run. Could I have fried the motherboard or is there any other explanation like maybe a cable going to hard drive disconnected or something? pretty important machine so neda get resolved quickly, can anyone help??

sure would be nice to know what type of ram?? 72 pin/sdram?? some ram runs at 3 volt, some at 5 volt. more details if you have them

Not sure of the voltage of the new or old RAM although now even if I put the old RAm back into place the machine lets out a beep (or double beep) and then sounds as if it starting up but nothing happens on the screen, and it IS connected properly. I then put the new RAM in and still the same problem. Is there anything else I could have done? In dire need of help

Buy a new motherboard. I had the same problem with a floppy disk (that I plugged upside down.) but this time, make sure you RAM cards are compatible by asking the one who sold you the new motherboard. It worked with me, but, don't do the same error that I did, check the processor speed because my new mother board came with 333MHz and my old processor runned on 400MHz. My father traded the 400 proc. for a 64mg ram card without checking the proc. speed. Also pay attention to the built-in card in your motherboard. If your new motherboard doesn't have the same built-in cards as you acient, you will have to buy them separately. After, build the computer with the working devices of your old computer and the new devices you bought.

One more thing, I have a cable coming from the hard drive with plastic on the end with four small pins - looks like it should be plugged in somewhere but not sure if it was before and might have inadvertently disconnected itfrom somewhere although can't see where - any ideas?