I have set up a new motherboard on an old chassis of a desktop PC. The mb has its own embedded GPU, and I haven't added any additional graphic card. I have connected the mb to the PSU through the 24-pin EATXPWR ATX power supply plug (I couldn't find out of the PSU any 4-pin connector to plug into the mb's chassis-fan plug). When switching on the PC, both the chassis fan and the CPU fan start working, but the monitor doesn't receive any signal. The monitor itself is working on other PCs. I am a bit lost about what steps to take before sending back the mb go the seller.
I have also followed without success the suggestions of the answer below by user3797758:
- I cleared the RTC ram
- mb is Asus B150M-C and looks perfectly compatible with CPU which is Intel Core i7-6700 (the CPU itself is shipped with Intel HD Graphics 530)
- I have tried connecting the pc to a HDMI monitor as well as to a different VGA monitor. Both monitors work well with the same cables, therefore the problem should not be there.
2 Answers
If newly assembled or modified desktop PC appears to have started (Fans, LEDs running etc) but does not display anything on screen, try the following.
- Ensure that all connectors are firmly attached to the respective components.
- In addition to 24 Pin ATX also make sure that 4 or 8 Pin CPU EPS power connector is firmly connected to the respective socket on the motherboard
- Run the system without RAM. If cabinet speaker is working & CPU is working you should hear some beeps indicating missing RAM. It also indicates that CPU is running the firmware
- Now start the system with bare minimum components, just one RAM stick if you have more than one, CPU & PSU. Try inserting/re-inserting RAM, if needed clean the RAM Contacts & RAM slot as it may help improve the firm contacts of all Pins. Sometimes this behavior is exhibited if all RAM contacts are not making firm contact with respective pins in the slot. Switch between RAM sticks if needed.
- Then try adding one component at a time and test if it starts now
Above steps worked for the user in this case. However any issues with PSU or motherboard / graphics or even CPU can not be ruled out as well. Even make sure that motherboard is not accidentally touching the cabinet.
some common things that you can try doing:
- Reset the CMOS, look in the instructions of the MB for how to do that on you specific model
- Try different video out ports, so if theres VGA, HDMI, Display Port, try those...
- Try a different cable, the one that your using to test with might be bad.
- Depending on the MB and CPU combination the MB may need the CPU to have the integrated GPU (many Intel CPUs are like this). So check that the CPU has this integrated.
Try these and comment bellow on what happens :)
btw, the PSUs fan is controlled by the PSU itself, you don't have to plug it into the MB
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