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Screen says no signal

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So i just got a new PC and a 24'' screen 3 days ago and they worked fine... but today when i came from school my PC turns on but screen just says no signal and turns off.
I checked all the wires and stuff that theyre well plugged.
Computer Specs:
AMD Phenom II X6 1055T, AM3, 2.8GHz
550W 550VXEU ATX V2.2
M4A87TD/USB3, AM3, AMD870, SATA 6Gbps, USB 3.0, AT
2x2GB, DDR3 1333MHz, CL9
AMD Radeon HD 6870 1 GB DDR5, DVI-I/DVI-D/HDMI/Dua
So plz.... help.
If anyone knows how to fix, reply.

Edited by Hermanni, 08 December 2010 - 11:02 AM.

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Cheapest item to begin troubleshooting with is a new signal cable to connect monitor to PC.
If still no signal, suspect the graphics card or monitor- take them back if both new.
Don't try & fix either yourself - you'll void the warranty.

Edited by phillipcorcoran, 09 December 2010 - 09:52 AM.

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