My XPS 8300/SSD boot/2 SATA drives/Win 10 will no longer load windows. At POST I get the Dell logo, the bar across the bottom of the screen, and the options to enter F2 or F12.After that, just the black screen with the underscore flashing in the upper left corner.

I've done the following:

• Reseated everything - memory, drives, graphics card
• Checked the power supply - fan runs fine
• The fans for the CPU and on the rear panel work fine
• Run all diagnostics under F12, everything passes regular and detailed scans
• Removed the battery, cleared the power per instructions found here, no change
• Tried to run the computer from the DVD drive, no change

I can't think of anything else to do. I've noticed more than one thread here about failing 8300 motherboards. Is that the likely possibility? How do I tell?

This is my last gasp trying to fix this, otherwise I'm going to have to get a new one, which I really can't afford. Any suggestions?

Thanks,

ejbSF