Changed case/Cleaned, Will not boot.

So today I got a new quite case for my PC (silencio 650). As I had to change all my components over into my new case I thought I would take the opportunity to clean everything and do a through job. I used air spray, and a rag to clean motherboard, drives and fans. I also took my heat sink off CPU and cleaned off old thermal paste with acetone and cottons buds, and replaced with new thermal paste.
Upon reassembling everything I plugged in and hit the start button. The fans all started but my monitor didn't detect anything. As I had installed a new graphics card I thought this could be the source of the problem, so I removed it and tried again. But still no luck. As I had not removed my ram, and haven't had any beeps. I don't think that could be the problem.
I was very careful the use a antistatic band through out the procedure and just hope i haven't wrecked my CPU. If anyone had an advice or insight it would be much appreciated.
I have a Phenom 2 X4 940 Black edition,Gigabyte MA785G-UD3H motherboard, Coolmaster RS-650 PSU, and graphics are irrelevant as they are removed.
Also something of interest, it will not turn off using the power button, I have to switch off at back.

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  1. Try resetting CMOS, hopefully that'll be all that's needed.
  2. Did the case come with a PSU or are you using your original PSU? If a new PSU, try another one.

    Next: no beeps. Did the new case come with a system speaker? If not, does the motherboard have one built in?

    I also recommend going back to the original configuration and getting that to work before you upgrade video cards.

    My standard troubleshooting reply follows.

    Work systematically through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

    If not, continue.
    The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

    I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

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

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. At this point, if you do not have a system (internal case) speaker, you really need one.

    Make sure you plug the CPU power cable in. The system will not boot without it.

    I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

    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, LED's, or fan activity:

    Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

    If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

    Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

    At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. 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 green wire should read 5 volts and drop to around 0 volts when you press the case power switch.

    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.

    A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

    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, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

    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.
    At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

    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.
  3. Hey,

    Yeah turns out i had plugged everything in but the CPU Power cable. I was a little confused as the manual is a bit unclear about that to do if you don't have a 2X4 12V power.

    Thanks for the help!
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