The "no signal" error can be caused by a couple of things. If you could do the follow:
- Make sure all hardware is securely connected to motherboard.
- Make sure all cable connections are secure.
- Confirm connections for both the 20-24pin MOBO power and 4-8pin CPU power.
- Unplug all extra peripherals connected to the machine that aren't required for operation. (This means all fans, optical drives, add-in PCI/PCIE cards.. etc. )
Moving forward, do you know if the motherboard has on-board video? If so, it's possible that it's defaulting to that instead of your discrete graphics. If you could provide a full spec list to help troubleshoot your problem it would help.
PS: Turning off caps lock when posting and replying will make more people want to help you.