HELP I need a new desktop PC

[Robbo3]

Until you can get a display on the screen we have no idea what the fault is.
IMHO it is unlikely to be the refurbished PC as these are normally wiped, a new OS installed then tested before being dispatched .... unless you bought it from a private individual whereby all bets are off.
Sometimes you can tell when a machine has possibly posted by the fan noise. If it ramps up then calms down it may well be ok but because there is no picture you can't tell.
Again, I go back to those adaptors. Until you can get a picture on the screen you don't know if it's a bios setting, a faulty Display Port or a faulty adaptor.

 

[HOJ]

Update, reply from supplier:

"When you press the power button a power cycle runs through the machine this is why it goes off.
Don't press the button again and let the power cycle complete, once completed the machine will turn on as normal.

Also, for the screen display please check if the input source is set correctly to HDMI or Auto selection. The USB stick is for the PC to connect internet wirelessly."


Not sure how long the "power cycle" is but after 30 minutes I gave up!

My screen is looking for an HDMI by auto selection, the only other possible issues is I am using a wireless keyboard, with a usb dingle, so going to get a wired one and try again, but the power thing seems really strange, it just runs for 20 seconds and goes dark..

 

[JSW]

Again, I go back to those adaptors. Until you can get a picture on the screen you don't know if it's a bios setting, a faulty Display Port or a faulty adaptor.

Yep, if the monitor isn't displaying the boot screen (HP Logo, Press Esc. to enter BIOS, etc) then there's something missing between the PC and monitor, the motherboard would have to be wrecked to get no BIOS, which is probably unlikely.

Update, reply from supplier:

"When you press the power button a power cycle runs through the machine this is why it goes off.
Don't press the button again and let the power cycle complete, once completed the machine will turn on as normal.

Also, for the screen display please check if the input source is set correctly to HDMI or Auto selection. The USB stick is for the PC to connect internet wirelessly."


Not sure how long the "power cycle" is but after 30 minutes I gave up!

My screen is looking for an HDMI by auto selection, the only other possible issues is I am using a wireless keyboard, with a usb dingle, so going to get a wired one and try again, but the power thing seems really strange, it just runs for 20 seconds and goes dark..

The power cycle is usually just a few seconds.

Did you try powering off at the mains, then pressing the PC's power button for a few seconds, then powering the PC back up again? Been awhile but I think that discharges the capacitors, it's worked for me in the past.

The wireless keyboard/dongle shouldn't interfere with the PC booting.

If you haven't tried it, and I realise this is all getting very tiresome now, turn the PC on with the monitor off, give the PC 30 seconds to boot, then turn on the monitor, if still no picture, turn the monitor off again, unplug the DP cable from the PC, and plug back into the 2nd DP input on the PC, then turn the monitor back on. This will 'force' the monitor to look for an input if there is one. you can leave the PC turned on while swapping the cable between DP inputs

 

[HOJ]

give the PC 30 seconds to boot

I have been swapping things about in the hope it may be a simple problem but the PC doesn't do anything, its been on since my last post, nothing, no blinking lights or a power on symbol on the switch, I reckon its a dead duck.

 

[JSW]

Google threw this up, never tried it but has to be worth a shot.

If you have a Windows PC and your screen is black or the display isn’t working, the first thing to try is a keyboard shortcut to either wake the device or restart the graphics drivers. Here are two shortcuts to try:

Wake the screen. Press Windows logo key + P or Ctrl + Alt + Del.
Restart the graphics drivers. Press Windows logo key + Ctrl + Shift + B.