How come my newly built computer turns on but sometimes nothing shows up on the monitor.?

My newly built system powers up but nothing shows on the monitor. I think its something to do with my hard drive or power supply. I need experienced system builders to help me with this.

Answers:
try reseating your memory and if that doesnt work, check the motherboard.
It sounds like you need to reseat the graphics card, also check the cable, and make sure it is connected securely to the monitor, and graphics card.

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