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Did you run the system diagnostics?
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Could be faulty RAM or just a flat CMOS battery, could also be corrupt BIOS/firmware that holds the pre-boot diagnostics. I would run Dell SupportAssist under the OS and see what that comes up with.
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mkramer777

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I have a Dell Insiron 3650 (windows 7 pro) When I turn it on it goes to the system diagnostics Dell screen, but the screen is all scrambled. &nbsp;I can't see the words. &nbsp;Not sure if this is a display issue at this point. &nbsp;The problem is everytime I restart the computer it goes into the diagnostics screen and not the OS. &nbsp;The only way to get into the OS is to select F12 (boot options) and then choose the hard drive (Toshiba). &nbsp;Then it boots. &nbsp;I looked at the bios and it shows that the hard drive is the first boot option.
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I have a Dell Insiron 3650 (windows 7 pro) When I turn it on it goes to the system diagnostics Dell screen, but the screen is all scrambled.  I can't see the words.  Not sure if this is a display issue at this point.  The problem is everytime I restart the computer it goes into the diagnostics screen and not the OS.  The only way to get into the OS is to select F12 (boot options) and then choose the hard drive (Toshiba).  Then it boots.  I looked at the bios and it shows that the hard drive is the first boot option.

Dell Inspiron desktop boot to sys diagnostics unless I choose boot options and boot to the hard drive

Boot issue

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

Operating Systems

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