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    These are two HP Elite Desk 800 Mini PCs from this supplier. They are both having the same exact issue.The one on the left is the first one I had purchased. This machine could not power on properly so I returned it. Yet, for reasons unknown UPS sent it back to me along with my replacement HP Mini PC. Yet, the new PC has the same exact issue as the original one. There is no display on my monitor, only beeping noises on the desktops, which are:3 Long Red beeps and 4 Short white beeps.According to HP Support, these codes signify various problems with the system such as a bad power supply (but I have 2 HP brand power supplies right here), secondly, HP says that it could be due to a bad CPU, bad motherboard, or bad RAM sticks.I have gone through the basic troubleshooting procedures that do not require opening the equipment. None of them worked, whether with the peripherals and without the peripherals. I also tried out different outlets, used these two power supplies.As for everything else that came with the product, it was nice that both HP's came with a brand new key lard and a wired mouse. Seems like they sent a USB wifi adapter with the second package as an apology (which was greatly appreciated). Unfortunately all of this equipment will have to be sent back.I will be talking to Amazon about ensuring both of these products are returned to the seller properly and will discuss where to go from there.I would advise anyone purchasing any tech from this seller to have the seller properly test their products before shipping them out to you.If the seller would like to contact me before I make the return, I am happy to further discuss the situation and see how this matter can be resolved.