20 Most Recent Dell Vostro 420 Desktop Computer Questions & Answers

from recent experience , it is the graphic card that has failed
I had a problem of the 2 screens suddenly going and then coming back on and a message the the nvidia kernal 387. suffered a fault recovered fully but the second screen never came back the same as screen 1
After I removed the card to fit a new card , that unfortunately had a different connection and therefore wouldn't connect a monitor , the computer would turn on a green light but would not turn on the system fans and all
I built a new mother board and the same thing--green light and nothing
I read forums and picked up this information. The computer in doing a hardware check before it goes to BIOS found a problem and stopped
the advice was to remove all hardware then insert a bit at a time until the problem surfaced
I fitted a ram card and the fans started
installed a monitor of the motherboard gva socket and it lit up
installed the graphics card with the vga connected to a monitor and it lit up
connected the second monitor and back to square one
end result , the original mother board is functional, the graphic card is stuffed
yours is probably the same

Dell Vostro 420... | Answered on Mar 01, 2017

check the power supply and the motherboard and yes also the power button

Dell Vostro 420... | Answered on Nov 06, 2015

IF THE POWER LIGHT IS BLINKING BLUE - The computer is in standby mode. Press a key on the keyboard, move the mouse, or press the power button to resume normal operation.

You can find its Service Manual here

Dell Vostro 420... | Answered on Apr 07, 2015

A steady or Amber blinking power button indicates a low voltage problem. This can be caused by a defective power supply or a defective motherboard. Just to make sure that nothing else is causing the problem, remove any PCI cards like modem, video card, sound card, etc... Remove the memory modules and disconnect cables to CD/DVD drives. Look at the USB ports to see if any are damaged.

Dell Vostro 420... | Answered on Jan 03, 2015


Dell Vostro 420... | Answered on Jul 19, 2014

It is always good to give some information about the case with your question, like if there was a power out, strange noise from the computer or anything that might suggest or assist helping you.

try this:
1. Unplug the power cord
2. Press the power button several times
3. Plug the computer back in to the power outlet and try again.

If it fails, try to open the side of the computer,
Check to see if when connected to the power outlet, you can see a led on the Motherboard turning on.

It might be that your PSU is dead.

Dell Vostro 420... | Answered on May 19, 2014

Awesomecrap!! Try this


Dell Vostro 420... | Answered on Feb 28, 2014

Your Power Supply or Motherboard is dead. I'd bring it into a computer shop for repairs.

Dell Vostro 420... | Answered on Jan 23, 2014

your computer power supply or motherboard is dead. I'd bring it in to a computer store for repairs/parts replacement. (if it's not under warranty, of course).

Dell Vostro 420... | Answered on Jan 22, 2014

Connect the pen drive to the USB . Is it working ?

Dell Vostro 420... | Answered on Oct 12, 2013

Replace the motor fan .

Dell Vostro 420... | Answered on Oct 12, 2013


There is no reset or fuse to reset. You may need to get replacement power supply. If the computer is plugged into a power strip or surge protector you can bypass it and plug the system directly into a wall outlet and power up.
Power Supply Light-on the back of the computer.
The light is a Green Light by the power supply.
Power Supply light is lit by a signal in the power supply called Power_Good (PG).
If the Power Supply Light Led is not light up, the power supply is defective.
If you need to replace the power supply you can contact the Dell Spare Parts Department at 1-877-717-3355bsat4ube4gblqiaaaaasuvork5cyii= or click the link below.

Dell Spare Parts

Thank You,
Dell-Jesse L
Dell Social Media and Communities

Dell Vostro 420... | Answered on Jan 15, 2013

Open Control Panel, User Accounts, Change password.

Dell Vostro 420... | Answered on Dec 18, 2012

bluescreen can be caused by a number of things

a bad driver loose or faulty lead or not having enough ram

click start control panel administration tools computer management device manager scroll through all of your devices

if you see a yellow question or exclamation mark ? ! or a red X you will need to update the drivers for this device right click select update driver/reinstall driver

if you can see your usb device but its not working scroll to Ports(Com&Ltd) right click to update driver

if you computer came with a motherboard disk the drivers could be on it

or you might have to download one

you might not have enough RAM random access memory not having enough will cause your computer to run over its maximum limits and can cause the blue screen of death and hang and cause memory dumps

make sure your ram modules have a dust free secure seating
if you dont want to install more ram uninstall some unnecessary programs

a bad or faulty motherboard lead or its connection
make sure all leads have a dust free secure connection

hope this helps you

Dell Vostro 420... | Answered on Mar 13, 2012

When the power is on, does it show an amber light that flashes on and off ?

Dell Vostro 420... | Answered on Feb 13, 2012

Hi Jason

Check this...

1) Make sure your monitor power on & the VGA cable fix properly.
2) Any Beep is coming after starting in your computer then report me,
3) While starting your computer make sure the power is on.

After above test ...if the all show positive then check this also

1) Open your computer case and remove the RAM and put is properly again.
2) Check HDD power & data cable.

Sure you get the solution............


Dell Vostro 420... | Answered on Dec 29, 2011

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