Could it be something with the monitor and not the machine???
Set up my new Inspiron 3881 last week, went through all initial set up procedures and then ran the programme to find the recommended updates. Did this and installed all the updates. Installed Office 365, my antivirus (Kaspersky) and installed the drivers for my printer (an Epson). All looked OK, powered off/shutdown the PC at the end of the day. Next day tried turning on and only got the Dell splash screen for less then a second, then black screen, can hear a noise (fan?) and power light comes on green and hard drive? light also flashing green. Each day since have had to power off/power on the PC around 10 times to get it to boot up to windows, sometimes a diagnostic programme runs and indicates a start up error has been fixed. Once powered up the PC runs OK, can run diagnostics and no errors show, can restart PC OK, but if turned off for over half an hour I have to turn power on/off around 10 times again. Every day have been trying different things that internet searches bring up to rectify the problem but with no joy. Have tried  changing the power supply, changing the power save option, taken off my printer and removed the drivers for it, removed my antivirus, plus disabled a couple of other options from the task manager start up. Have run the windows additional trouble-shooter and sometimes get the problem found is check for windows update. On checking windows update find the latest update 2021-03 cumulative update for windows 10 ver 2004 for X64 systems (KB8007002) comes up, but when I try to install the update it doesn't download and comes up with the message will try again later. One internet search suggested file may be corrupted and to delete the file and try again (as suggested I renamed the file first) and tried again, but still wouldn't install. From the Dell site tried this morning to enter the built in diagnostics by tapping the F12 key on power up, only get the Dell splash screen for a second with the progress bar at the bottom, then the screen goes black as usual. Again needed to power off/on around 10 times before I could get to the menu and run diagnostics - again when run all shows as OK and can get to my home screen quickly. Now don't know what to do  hence the long post on here. What makes it worse is we have already had another Inspiron 3881 purchased from Dell (now returned) that exhibited the same or very similar problem, with this one I contacted technical support several times and they took me through a hard reset, returning everything to factory settings etc, the F12 diagnostic but each time everything seemed was Ok, that is until the PC was turned off for some time and the problem reappeared.
New Inspiron 3881 requiring repeated power ups before booting up