OK - from what I can gather, the flasher itself hung, not the drive itself since the flash, seeing as you can still run DVDInfoPro etc.
Something similar happened to me, when I was crossflashing a Sony CD-RW drive, in an external enclosure - but in my case, I actually got an error message from the flasher once the flash had completed. Drive works perfectly to this day though, crossflashed and all.
Have you tried actually burning a CD/DVD in the drive? If a burn completes and it has no problem reading burned or pressed CD/DVD media I'd say the drive is working. You also may like to check with something like Nero InfoTool (available as a standalone download if you don't use Nero) - it should say RPC1 and/or for user changes left, "n/a" or similar.
When I asked about the possibility of a disc in the drive, it was just to cover all bases and possibilities