I my case that was RAM. Had a continuous beeps from motherboard with no boot, checked everything, except memory on my second comp. Whole time (I lost almost whole day in great great frustration) I thought its video card because monitor signalized "no vga signal". Finally I pull up my three RAM modules and tried to install it randomly. Succeed with the first one farthest from CPU, got boot. After that I install the second one next to the first, again got boot, finally tried to install the third one but again got the problem. So I start from the beginning, this time installed only two of modules on same places like before, without the third one, and my comp is now working.
Note: The modules are of the same memory PC2 - 6400, but not from the same manufacturer, two kingmax and one mushkin. The problem was with the mushkin. I also have to note that comp worked almost 3 years with those 3 modules without problem, when i buy a new one, and left this old one. The problem with beeps arise after two years when I tried to use it again for my children.
Hope this will be helpful.
Haris
Note: The modules are of the same memory PC2 - 6400, but not from the same manufacturer, two kingmax and one mushkin. The problem was with the mushkin. I also have to note that comp worked almost 3 years with those 3 modules without problem, when i buy a new one, and left this old one. The problem with beeps arise after two years when I tried to use it again for my children.
Hope this will be helpful.
Haris