No signal at post... HELP PLZ

Well, everything was fine with my system beside the fact that i am RMA my HD 5870 (GSOD, lockups, ect.) But still, i had graphics at boot. Yesterday, ive flash my mobo BIOS with the new F4 BIOS since, apparently, you can lower your CPU voltage with the BIOS. Since all my OC setings were lost (didnt save them with qflash) i wanted to see with AMD OverDrive Auto Clock tool, the results and for fun, lol. 1 seconds after ive start the proccess, my whole PC froze and i was force te reboot. But, i got no signal at the reboot. The computer start and everything seems fine but i dont have any visual and i know that the pc is not loading in Windows (when in windows, my keyboard is lighting up, ive wait more than 5 minutes... So, this is where i am now. Stuck with no visual at boot.

Ive tried: Clearing the CMOS with the switch right one the mobo, with the jumpers and with the battery. Didnt work. Ive switch my card to the other PCIx16 slot, same result. Im in the process to get a new HD 5870 but im affraid the i will stil have no visual at start. Im pretty sure ist the motherboard but can it be something else?

Anyone has seen something like that??
Sry for my english, im french

Gigabyte 890FXA-UD5 rev.2.0 - F3 BIOS
PhenomII 965@4100Ghz, 1.450v / Scythe Yasya - Ultra Kaze fan... Idle@35, Load@47-48 - NB@2600
G.Skills Ripjaws@1600Mhz, 7-7-7-20 1T
HD 5870 XFX XXX@925/1275
Corsair TX750
Antec 902 - Custom
3 answers Last reply
More about signal post
  1. Bump
  2. I think you have been messed up with flashing motherboard things...
    Maybe you can try different mobo, if that succeed then you have a defective mobo...

    Or try your card in different PC to make sure whether the card is fine or not.
  3. You need to backup and start from the beginning.

    Work through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it.

    Breadboard - that will eliminate 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.

    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 reuced.

    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.
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