I just built a new computer. When i start up, everything comes to life, there are lights on on the mobo, graphics card, and all fans are working, yet nothing will display on my monitor. I tried several different cables and also a different monitor. This monitor works fine though, i use it with my laptop. What do part of computer do you think it is most likely? obviously i would lean towards video card but i have no idea where to go from here. asus Mobo core i5 4 gb ddr3 HIS radeon hd 4890 turb 1gb 750gb hdd

Apparently you didn't benchtest your hardware before installing it in the case? And I don't see the power supply on your spec list? Do you get a single beep at startup? Any beeps at all? "If you take the time to bench test your build prior to full assembly you will save yourself hordes of time in troubleshooting a faulty component" How to Bench Test Your System

sorry forgot about psu. 630 watt. and no i didnt benchtest before building. first time building, i probably should have done that. ive been trying to narrow down the faulty part. i dont have an incase speaker, and i dont think mobo beeps work with external speaker?

just for some more information: when i start it, the gpu fan is spinning, there is a green LED lit on the mobo next to "boot_device_LED" and a red LED lit on mobo next to "cpu_LED" there are also 3 red lights on the gpu

"sorry forgot about psu. 630 watt" Wattage isn't as important as quality of the PSU & the amperage specs, plus you need to have all the required plugs. A decent 630W unit costs about $75 & for your system, you need one with an 8-pin ATX12V/EPS12V plug...that connection is what powers the CPU. Is your PSU compatible the Core i5/i7? "i dont have an incase speaker" Why doesn't your case have an internal speaker? You need to hear the beep codes (or lack of). Get a speaker. Here's an example: http://www.pcloft.com/casespeaker.html "no i didnt benchtest before building" Gut the case & benchtest your hardware.