Having problems with your HP Pavilion a420n PC Desktop ?

I replace my motherboard and CPU i got power on fans and front but i got nothing on screen

Answers :

Try to change your memory module inside to your CPU unit. Or try resetting the EEPROM BIOS by removing the Lithium Battery jumper which\015\012should be located right next to the shiny disk thing on the Motherboard (the battery). Remove it after about 20 seconds.
Usually when no display available, you will hear a beep recognizing that your Motherboard are good or not. Count how many beeps, and if beeps at 4 counts. Plug-in properly your Memory Module and PCI VGA Card.
Hope this might give you a tip.
Tell us more if the problem exist.
Good luck!

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Disconnect all devices from the power supply EXCEPT the motherboard
Remove any extra cards including video etc.(plug monitor into the onboard)

Power up the pc and see if the fans are working.
If not then double check the power connections to the board.

If you still have no fans it is time to suspect the power supply as the probable cause.

If the fans worked then you should have gotten a display which told you there was an error and offering you a chance to go into the BIOS. ignore it and shut down the PC.

Now connect one drive only and boot again.
Repeat that until you identify the component that is giving you a problem.

Once you find the problem then remove or disconnect and carry on with the rest to see if another component might also cause a problem

If there is only one problem device then you may want to investigate that device further, Unless you don't mind replacing it.
Repair Help & Product Troubleshooting for HP Pavilion a420n PC Desktop

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