I have a new W541 and am trying to install my SSD. I get through the Windows 7Pro installation (Retail, my license), and managed to hook up to my WiFi. But there is some driver installing that is causing error code PXE-E61 Media Test Failure. It gets stranger - the computer boots if I use the power button. But, if I use restart, Windows wont load and I get the MediaTest Failure. I cant even find my hard drive in BIOS. But when I use the power button and the computer fires right up.
I think I could get by this, but the driver list on the Lenovo site serves up drivers that don't go to my system. I am at a bit of a loss here.
This is unlikely to be a driver problem. It's more likely a compatibility issue between the BIOS in your laptop and the SSD's firmware.
This is unfortunately not uncommon. If the SSD's firmware takes a little too long to re-initialize after a soft reset (as in a reboot, or sometimes exit from BIOS setup) the BIOS can fail to detect it before it times out and decides there's no main drive present. Without a main drive to boot from the BIOS steps down its boot list and eventually tries to boot over the network. Since you're not connected to a PXE network boot server it throws that error.
The first thing to is check with the SSD vendor to see if there's a newer version of firmware.