I just installed the Intel DP35DP with an Intel Core Duo processor, I also added the required DDR2 RAM. I also upgraded the power supply. When I turn on the computer nothing happens. The monitor says No Video Detected and the USB ports don't work (i.e., I plug in any USB device like my lighted keyboard and nothing happens). I also have a new GeForce 7600 PCI-E graphics card.
The first time I turned it on after installation the initial Intel screen asking me whether I wanted to use F2 to configure the system. I couldn't do it because my USB keyboard, USB mouse, etc doesn't work. When I powered off and on again I get absolutely nothing but the blank video screen.
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Your motherboard can support up to 8 Gb of ram, of type DDR2 667 MHz or 800 MHz. In practice 667 would do I believe as the performance difference is not great in practice. The board has 2 DIMM sockets for this.
It depends somewhat on your OS and what you want to do. I'd try 4 Gb first. Bear in mind that added ram doesn't actually speed the computer as such, only a faster CPU does that, but it will allow more windows to be kept open, and cut down on data swapping to virual memory on the hard drive.
I found the manual on the net that gives you instructions on replacing components if you're not sure how, it can be found here.
The Compaq Presario C700 uses DDR2 Laptop RAM as shown below.
The motherboard of the Presario C700 has two RAM slots, one of them will be occupied by the 512MB RAM (running at 667MHz) module you have at present. This leaves one more that can accomodate a DDR2 667Mhz card of up to 1GB or you could get two 1GB DDR2 800MHz (the faster DDR2) cards and remove the 512 leaving you with a wopping 4GB of memory, that'll definately speed it up. Just remember the Presario C700 can only have up to 2GB of RAM so don't go higher than that or Windows will not boot for some reason.
The Presario C700 supports any Socket P, Core 2 Duo or Pentiun Dual Core chips. The fastest processor you can get is the Intel T8300 2.4GHz Core 2 Duo Processor with 3MB L2 cache and an 800MHz FSB
For a full list of compatible processors go to page 9 of the user manual found here.
You needed to configure bios (F2) when you first installed the processor,
now the Bios hangs before anything can happen, You need to remove the Bios Battery (looks like a coin on the mobo) for about 30 secs (with the power disconnected) then re-insert the battery and power on.
you should get the same power on message as you did the 1st time (maybe with a missings settings error too but this is expected)
Enuro12 is right about legacy USB in that your keyboard should work in BIOS (setup)