Does anybody have the specs for the Dell 03C6YH motherboard please

You did not mention the name/mod of the board? Nevertheless: Go on line to the manufacture of the board. See Support for Motherboards: Type in the Data they ask regarding the board: The download the Manual.

Intel 975X motherboard chipset, and an LGA 775 processor socket.

http://en.wikipedia.org/wiki/List_of_intel_chipsets#Core_2_chipsets

Scroll down to 975X in the left column.

Looking across the chart for the 975X note the processor support.
Intel Pentium D
Intel Pentium Dual Core
Intel Core2 Duo
Intel Quad Core

Listed in order of performance.

Also note that 45nm and 65nm architecture, Intel processors are supported.
(nm = NanoMeter. 1 Billionth of a Meter)

Also look at the Front Side Bus support. (FSB)
Either 533MegaHertz, or 667MHz, or 800MHz or 1066MHz.

Now look at the ram memory frequency rate ('Speed') supported.
533MHz, or 667MHz, or 800MHz.
Depends on what Processor is used.
Rule of thumb is; ram memory typically operates at half of the FSB of the Processor.

Remember that when selecting ram memory for your motherboard.

Or if you have existing ram memory you wish to use, choose your processor using the above rule of thumb.

http://www.dell.com/us/en/bpi/desktops/precn_390/pd.aspx?refid=precn_390&s=bpi

Click on the Tech Specs tab
(Overview / Product Views / Tech Specs )

Supported by the Intel 975X motherboard chipset specs, on Wikipedia link above.

http://support.dell.com/support/edocs/systems/ws390/multlang/DAO_BCC/GH458A00.pdf

http://support.dell.com/support/edocs/systems/ws390/en/ug_en/HTML/index.htm

For additional questions please post in a Comment.

Regards,
joecoolvette

Manual:
http://support.dell.com/support/edocs/systems/dim2400/en/F75560LRs.pdf

Specs:
http://support.dell.com/support/edocs/systems/dim2400/en/sm_en/specs.htm

Find it here :
http://support.dell.com/support/edocs/systems/dim4700/sm/specs.htm#wp1043338
and
http://support.dell.com/support/edocs/systems/dim4700/sm/index.htm

cheers

did you solve this problem or not?

Look at the SERVICE TAG on the back of the DELL computer.
Enter that unique(!) code on the manufacturer's web-site:

http://support.dell.com

and you'll get _exact_ information about the "as-shipped" inventory of parts in your DELL computer.

HDD Controllers are IDE
http://support.dell.com/support/edocs/systems/op160l/en/ug/specs.htm#1135527

Go to dell.com, go to product support, and enter the service tag #, and you'll be able to get all the original specs on your system.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Please try to check your VGA card placement to its slot, then check its cable connections, if still the same problem, try to connect your monitor to another PC & if it operates, then your VGA card is defective. regards

link to specs