No Video, No Beep on Boot Up

So I built a new mini-ITX system, but it is not posting. G620T, Asrock H67M-ITX, 4gb G.Skill (on compatibility list), etc.

Here is the problem when power is turned on:

- No video
- No beep(s) are heard
- But, all fans and cpu fans turn on though

I have pretty much tested it with the parts laying out on the table--only the power supply is attached to the CPU/MOBO/RAM. I use a screwdriver to short the power switch and turn it on.

I initially thought it was the motherboard, but when I took OUT all the RAM modules and try to boot up, the system actually gives me the long beeping noises that tells me that the motherboard actuallyknows there is no RAM installed... which also leads me to suspect the CPU.

What do you guys think?


EDIT: I have also tested the system using another power supply, but same problem.
13 answers Last reply
More about video beep boot
  1. if it gives you a RAM error , but none when all is installed

    then I suspect the cable you are using to connect to the monitor
  2. thanks for the tip. i will try it again, but i actually tried the system thru the VGA, DVI, AND HDMI outputs, but all still do not work. I will try the DVI output with my "open system"

    Any other suggestions?
  3. ok i just tried the video output on VGA and DVI again, still no go.

    i also tried placing a dedicated video card to see if that would help, but as expected, it didnt.

    i have also tried clearing the CMOS/taking out the battery/etc...
  4. cpu... something similar happened to me and it turned out to be the cpu check the pins that's a easy way to find out
  5. Yeah possibly bent pin on motherboard.
  6. if its pins its the mobo... ill go check that out
  7. it's not bent pins... just checked

    how do i check if its a bad cpu and not a bad mobo? =\
  8. CPU's are seldom the problem with a non booting new build. And if you have changed the PSU with a known, working power supply, the problem is likely to be the motherboard. You can do a little testing and perhaps be certain.

    When you are asking for help, always start off with the system specifications.

    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.
    http://www.tomshardware.com/forum/262730-31-breadboarding

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

    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:
    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 (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button, then back to 5 volts when you release the case power switch. 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.
    http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdata

    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.
  9. thanks jsc for the helpful post--i have read it and tried it already though! there is only silence after trying to power the system on. i will RMA the board and hope that it will solve the problem.

    i didnt know what i did with the components lying on the bench had a term (breadboarding), i have done that for a long time too =D
  10. uraflit said:
    thanks jsc for the helpful post--i have read it and tried it already though! there is only silence after trying to power the system on. i will RMA the board and hope that it will solve the problem.

    i didnt know what i did with the components lying on the bench had a term (breadboarding), i have done that for a long time too =D


    if the pins arnt bent to see if its a bad mobo check the capicators on the mobo. if they are movable at all ur mobo is fried if they look like they are expanding its ur mobo and unfortntly the only way to test a bad cpu is by using a diff 1
  11. May seem obvious, but I just had similar problems because I forgot to plug in the 4 pin 12V power connector.
    Fans would spin, no LAN or keyboard LEDs though, looked over the board and saw the missing power connector.
  12. Wow. There is some really good advice in this thread. Kudos and thanks to all the posters.

    I finally sorted out my no beep no boot problem (after 4-5 hours frustration) by doing the cmos reset with the jumper at the bottom of the board. This was an ASROCK 990FX Extreme 3 motherboard straight out of the box. Kind if frustrating that you need to reset something and fiddle with jumpers even before you start.
  13. i have the same issue and ive tried the jumpers too and still no luck, ive tried an i3 and ai5 processor, tried 3 diffrent psus, an unbranded 750watt, a antec 550w and a 300watt from a working pc, still no luck, ive tried 5 diffrent graphics cards, no luck, tried with diffrent ram, 4 sticks, 3 sticks, 2 sticks and even 1 stick, still no luck, tried diffrent vga cables, no luck, diffrent hard drives, again, no luck and ive replaced the bios battery too, once more no luck, im lost for words with the motherboard i have (asus p8p67 rev 3.1) it lights up, everything else lights up, no beeps, ive even taken the ram completely out to power it to hear a bleep, still no beep... TF is going on, is my motherboard dead? D:
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