F750us wont power up

[roger69]

I have a Compaq f750us and I have replaced the mother board and the processor. When the power button is pushed the blue lights come and go right back off. That is what it was doing before I replaced everything. I don't know what else to replace. Any idea's

 

[house70]

Make sure the PSU is OK. you could borrow and try a different PSU to test that.
Also, make sure all the power cables are connected to the mobo. Sometimes people forget the little 4-pin connector.
Ensure the thermal paste is well applied on the CPU and that the heatsink makes good contact with it.
Try to reboot using only one RAM stick; remove all un-necessary hardware, including the video card (if it has a discrete one) and the HDDs and reboot. You should get some error beeps signaling the BIOS is booting and the video adapter is missing. Let us know how it goes.

 

[roger69]

Make sure the PSU is OK. you could borrow and try a different PSU to test that.
Also, make sure all the power cables are connected to the mobo. Sometimes people forget the little 4-pin connector.
Ensure the thermal paste is well applied on the CPU and that the heatsink makes good contact with it.
Try to reboot using only one RAM stick; remove all un-necessary hardware, including the video card (if it has a discrete one) and the HDDs and reboot. You should get some error beeps signaling the BIOS is booting and the video adapter is missing. Let us know how it goes.

Thanks I'll give it a look see