What is happening when computer light (when

you bringing a marginal part or connection back up a working state. when it cools or voltage drops it goes to the non working state. hp power supplies are not good to begin with. replacing it will fix it till that one also fails

I disagree with ikkenom only due to the symptom of the flashing blue light. This would indicate to me that the monitor is not getting any display signal and is in sleep mode at least the is what happens on my Samsung monitor. Used to be that they use a two color led in the monitor, green when ON and getting display signal and amber or orange when in sleep mode. I would check the computer by trying a different monitor. If you have a second monitor, great, if not, maybe a friend will let you bring your computer over and try the computer with their monitor. Could also be a display adapter setting. Do you get any change when you first turn on your computer? i.e. Do you get the BIOS or manufacturer screen when first turned on? Also if you disconnect the monitor cable from the computer and power cycle the monitor, do you get a No Signal display for a few seconds before the monitor goes black and the blue light starts flashing?

Let me know what happens with the testing above or if you need further instructions to carry out testing.

Thanks, Jim

when i turn the printer on the light flashes amber several times, then green then repeats flashing amber, and back to green etc. turning it off and back on made no difference. last time it worked normally after being off for a couple of days, but now it is doing that again.

Amber light flashes 7 times, then green for a couple of seconds, then amber 7 times etc.

The amber light means the cover is not closed all the way. Something is preventing the cover from staying latched closed - it's releasing just enough to activate the cover-open sensor. Maybe check if you can see anything broken where the cover latches shut.

Not sure if this will be too helpful...

First--was it working?
Did it suddenly stop?
When you see the LG logo, then it goes away, does the power light turn from green to amber? Sounds like that doesn't happen.
So--if you are getting a signal, you should see something.
If there is no signal, then the power light should change from green to orange.
With no lights at all, I suspect a faulty monitor.

dos it work use a new monitor

You either have a hardware problem with your video card. ( may have pop out of socket when you plug in the monitor) or the cable is not allow communication to the monitor. As long as the amber light comes on you know you have power so focud on data cables and hardware.

I think it maybe time to buy a new monitor

1st thing, disconnect everything but keyboard mouse and monitor, see if anything changes.

If the issue persists, ensure that all power and card connections for the motherboard are tight and secure. If you've added RAM or other parts, remove them. Reseat the RAM in the motherboard that came from Dell.

If none of those ideas have any effect on the issue, replace the motherboard.

Sounds like will need component-level electronic troubleshooting, probably in the power supply section.