Lights, no POST codes, no video output


Apr 24, 2010
This is a new build. Upon start up I have no video output and no post codes unless I pull the RAM. I have not seen the boot screen yet so I do not know if there are any other issues.

Heres what I have in it right now

i3 530
Stock CPU fan
Intel DH55HC
OCZ Gold 2GB DDR3 1066
Sapphire Radeon HD 5670 (100287VGAL)
Rosewill RX750-S-B 750W
1TB WD Green
Rosewill FE-A030 case
Hyundai X93W

Windows 7 ...when I can get that far...

After the full build I powered it up only to have the lights come on and no video. While I and sure there are somethings I missed here is what I have already tried doing and what happened when I did it:

Started computer - as described
Powered down and swapped monitor - no change
Removed video card and flashed - no change
Re-attached Hyundai monitor - no change
Re-installed video card connected with DVI - no change
Removed RAM - POST memory error
Re-installed RAM - as described
Inserted Windows DVD - Screen flashed "no signal input"

At this point I removed the DVD and cycled through the list again ... all of those steps. Now the system flashes "No signal input" at each boot.

Please let me know if there is any information I may have left out.


Apr 24, 2010
1. Did you carefully read the motherboard owners manual?


2. Did you plug in the 4/8-pin CPU power connector located near the CPU socket? If the motherboard has 8 pins and your PSU only has 4 pins, you can use the 4-pin connector. The 4-pin connector USUALLY goes on the 4 pins located closest to the CPU. If the motherboard has an 8-pin connector with a cover over 4 pins, you can remove the cover and use an 8-pin plug if your power supply has one. This power connector provides power to the CPU. Your system has no chance of posting without this connector plugged in! Check your motherboard owners manual for more information about the CPU power connector. The CPU power connector is usually referred to as the "12v ATX" connector in the owners manual. This is easily the most common new-builder mistake.


3. Did you install the standoffs under the motherboard? Did you place them so they all align with the screw holes in the motherboard, with no extra standoffs touching the board in the wrong place? A standoff installed in the wrong place can cause a short and prevent the system from booting.


4. Did you verify that the video card is fully seated? (may require more force than a new builder expects.)


5. Did you attach all the required power connector(s) to the video card? (some need two, some need none, many need one.)


6. Have you tried booting with just one stick of RAM installed? (Try each stick of RAM individually in each RAM slot.) If you can get the system to boot with a single stick of RAM, you should manually set the RAM speed, timings, and voltage to the manufacturers specs in the BIOS before attempting to boot with all sticks of RAM installed. Nearly all motherboards default to the standard RAM voltage (1.8v for DDR2 & 1.5v for DDR3). If your RAM is rated to run at a voltage other than the standard voltage, the motherboard will underclock the RAM for compatibility reasons. If you want the system to be stable and to run the RAM at its rated specs, you should manually set those values in the BIOS. Many boards don't supply the RAM with enough voltage when using "auto" settings causing stability issues.


7. Did you verify that all memory modules are fully inserted? (may require more force than a new builder expects.) It's a good idea to install the RAM on the motherboard before it's in the case.


8. Did you verify in the owners manual that you're using the correct RAM slots? Many i7 motherboards require RAM to be installed in the slots starting with the one further away from the CPU which is the opposite of many dual channel motherboards.


9. Did you remove the plastic guard over the CPU socket? (this actually comes up occasionally.)


10. Did you install the CPU correctly? There will be an arrow on the CPU that needs to line up with an arrow on the motherboard CPU socket. Be sure to pay special attention to that section of the manual! [...] 299985.htm


11. If using an after market CPU cooler, did you get any thermal paste on the motherboard, CPU socket, or CPU pins? Did you use the smallest amount you could? Here's a few links that may help:

Benchmark Reviews

Arctic Sliver [...] re=related


12. Is the CPU fan plugged in? Some motherboards will not boot without detecting that the CPU fan is plugged in to prevent burning up the CPU.


13. If using a stock cooler, was the thermal material on the base of the cooler free of foreign material, and did you remove any protective covering? If the stock cooler has push-pins, did you ensure that all four pins snapped securely into place? (The easiest way to install the push-pins is outside the case sitting on a non-conductive surface like the motherboard box. Read the instructions! The push-pins have to be turned the OPPOSITE direction as the arrows for installation.) See the link in step 10.


14. Are any loose screws laying on the motherboard, or jammed against it? Are there any wires run directly under the motherboard? You should not run wires under the motherboard since the soldered wires on the underside of the motherboard can cut into the insulation on the wires and cause a short. Some cases have space to run wires on the back side of the motherboard tray.


15. Did you ensure you discharged all static electricity before touching any of your components? computer components are very sensitive to static electricity. It takes much less voltage than you can see or feel to damage components. You should implement some best practices to reduce the probability of damaging components. These practices should include either wearing an anti-static wrist strap or always touching a metal part of the case with the power supply installed and plugged in, but NOT turned on. You should avoid building or working on a computer on carpet. Working on a smooth surface is the best if at all possible. You should also keep fluffy the cat, children, and fido away from computer components.

I took the base precautions but was not wearing a wrist strap

16. Did you install the system speaker (if provided) so you can check beep-codes in the manual? A system speaker is NOT the same as normal speakers that plug into the back of the motherboard. A system speaker plugs into a header on the motherboard that's usually located near the front panel connectors. The system speaker is a critical component when trying to troubleshoot system problems. You are flying blind without a system speaker. If you case or motherboard didn't come with a system speaker you can buy one for cheap here:


17. Did you read the instructions in the manual on how to properly connect the front panel plugs? (Power switch, power led, reset switch, HD activity led) Polarity does not matter with the power and reset switches. If power or drive activity LED's do not come on, reverse the connections. For troubleshooting purposes, disconnect the reset switch. If it's shorted, the machine either will not POST at all, or it will endlessly reboot.


18. Did you turn on the power supply switch located on the back of the PSU? Is the power plug on a switch? If it is, is the switch turned on? Is there a GFI circuit on the plug-in? If there is, make sure it isn't tripped.


19. Is your CPU supported by the BIOS revision installed on your motherboard? Most motherboards will post a CPU compatibility list on their website.


20. Have you tried resetting the CMOS? The motherboard manual will have instructions for your particular board. [...] -cmos.html


21. If you have integrated video and a video card, try the integrated video port. Resetting the bios, can make it default back to the onboard video.



Do you have access to a different power supply? Rosewill is not exactly know for their quality. Or they are but in the wrong way ;)

You only need a quality 400w unit for the listed specs. 450w max.

Got an old video card you can try? Could be DOA.


Does the system generate any POST beeps or do you get silence?

If you get silence, strip all the parts out and follow the instructions in the "breadboard" thread:

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

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.

The best way to test the PSU is to replace the PSU with a known good one of similar power capacity.

Brand new, out of the box, untested does not count as a known good PSU.

Next best thing is to get (or borrow) a digital multimeter and check the PSU.

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. 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. You can carefully probe the pins from the back of the main power connector to check the voltages.

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