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As the title says I'm having trouble with the display, when I turn it on nothing comes on the display all the buttons light up and the touch screen buttons work and it has the green light at the back on the motherboard.
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Try a power refresh and check if that resolves the problem.
Disconnect the power to the AIO and then disassemble the AIO to gain access to the motherboard and then remove the coin cell battery¹ from the motherboard.
Here's the maintenance and service guide for the AIO that will help. Go to p.87 to view the procedure to remove the systemboard. You don't have to remove it, just gain access to it so that you can remove the coin cell battery.
Press and hold the power on button for 30 seconds and then release it.
Reinsert the coin cell battery (remember +ve on top as marked on the battery), reassemble the AIO, reconnect the power and check if it now turns on OK.
If it turns on OK there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to factory default. Once the date and time have been corrected, the message won't appear the next time the AIO is started. Also any user definable BIOS settings that were changed by you to suit whatever system requirements you had, will have to be changed back again.
¹ When the coin cell battery is out, check its voltage. If it is <2.5V DC or >4-5 years old, replace it. It is a CR2032 Lithium coin cell 3V battery that is commonly available everywhere e.g. supermarkets.
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Thank you I've tried it and even replaced the battery and the screen still hasn't come on however the fans seems to have calmed down a bit, is there anything else I can try
When you turn the PC on, what colour is the power LED and is it on steady or is it flashing?
The LED next to the power button is red and steady and the one on the motherboard is green and steady
Unusual for the Power LED to be red and steady because if there's a POST problem, it should be flashing an error code - see p.188 of the maintenance manual linked above.
Assuming the you don't hear any beeps either, try the following:
Disconnect the power to the PC and then open it and remove all the ram modules from the motherboard - see p.52
Once removed reconnect the power to the PC and turn it on.
It should fail with 5 beeps and the power LED flashing red 5 times, repeatedly i.e. 5 beeps/flashes > pause > 5 beeps/flashes > pause etc
If it doesn't then either there's a power problem (PSU?) although it could also be a motherboard problem as well
It did fail and did flash and beep 5 times like you said.
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The "5 short beeps" error code you're encountering on your HP EliteDesk 800 G1 Small Form Factor PC usually indicates a pre-video memory or memory-related issue. a. Ensure that your RAM modules are properly seated in their slots
It could also indicate a CPU problem. That would also be the reason the fans are running fast because the CPU is overheating. It may be worth while to change out the CPU.
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Hi @ruggb,
The 5 beep error code was in response to me asking the OP to remove the ram and check if there were any beep codes heard.
Prior to this there wasn't any indication at all as to what was happening except what was said in the original question
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