Hello, I have a Precision T3500 that will not boot a known good WIN7 drive. I actually have two of these desktops, and have used the working one to verify that the hard drive is not the issue. I also cannot boot to a bootable usb drive to even get to the preinstallation environment. This unit is out of warranty, I'm wondering if anyone has ideas......motherboard? It also has a second hard drive slot and I have attempted to boot from the second slot (Disk 1 vs. Disk 0) with no luck. Diagnostics freeze during the extended test. Any thoughts would be appreciated. Thanks very much.
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