Help: New build, No signal on monitor

I have been having a hell of a time trying to get this new build I got to work. Before I go into details about the problem, here is the specs:

Video: HIS H487Q1GH Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card

Monitor: Acer P235Hbmid Black 23" 5ms HDMI Widescreen LCD Monitor

Hard Drive: Western Digital RE3 WD3202ABYS 320GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Memory: Crucial Ballistix Tracer 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory w/ Blue LEDs Model BL3KIT25664TB1608

CPU: Intel Core i5-661 Clarkdale 3.33GHz LGA 1156 87W Dual-Core Desktop Processor Model BX80616I5661

PS: APEVIA ICEBERG ATX-IB680W-BL 680W ATX12V / EPS12V SLI Ready Power Supply With 3-Color LED Lights

Mobo: ASUS P7P55 LX LGA 1156 Intel P55 ATX Intel Motherboard

I have rebuilt the computer 3 times and still no signal from the monitor. The computer turns on completely, but no signal from the monitor. I realized my Power supply was not compatible with my video card so I replaced that with a Corsair 650W PS. Still no Signal. I even sent back the video card to New Egg and got a new one, however still no signal on the monitor. I reset the motherboard via the jumpers, and also removing the CMOS battery for about 5 minutes to reset the BIOS. Still, the same problem.

Has anyone else had this problem in the past? I spent over 1k on this equipment and I can't seem to get it to work no matter what I do. Everything is hooked up correctly, I know for a fact. It also provides me no POST codes which makes it even harder to troubleshoot the problem.

Any suggestions? Thank all of you so much for your help, I dont want my 1k worth of equipment to be a really expensive paperweight!
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More about help build signal monitor
  1. Have you read through and completed the checklist listed in this thread (part of the master sticky)...

    PERFORM THESE STEPS before posting about boot/no video problems!
  2. I have the exact same problem with the same motherboard. Could you figure out the cause?
    My mobo was replaced but I still have the same problem. I did several tests and I think my RAM ist the problem.
  3. isn't your mb a duel channel memory but you got a tri channel memory so you only need to install 2 memory module and try to boot the system
  4. Work through our standard checklist and troubleshooting thread that tecmo linked to:
    I mean work through, not just read over it.

    Breadboard - that will isolate any kind of case problem you might have.

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:

    You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

    You should hear a series of long, single beeps indicating memory problems.
    Silence indicates a problem with (in most likely order) the PSU, motherboard, or
    CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

    If no beeps:
    At this point, you can sort of check the PSU. Try to borrow a known good PSU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    This checks the PSU under no load conditions, so it is not completely reliable. But if
    it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

    If the system beeps:
    If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should
    change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

    Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

    Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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