I made the leap forward to SSD with 2 laptops and 1 desktop. I had to prep my one OCZ Agility 90GB prior to OS installation, but my system would boot up past the post diagnostics with just an error of No OS Found. The Toshiba System Restore utility would boot and come up with No Hard Drives Detected as for it was having a hard time finding the SSD and only option was to exit the system restore.
So your not getting a successful post ( HP Logo or detailed boot stats )?
I'd perform the flash to the BIOS with the original hard drive installed. If the BIOS is already at the version you are trying to flash it to, it wont hurt the computer and it will probably show a screen that shows existing BIOS Flash Version and the Flash version to be applied. If they both match you can exit the flash process as for you are already at the latest version.
*The prep that I had to perform to my SSD was that I had to connect it through a SATA to USB cable and make it act as an external hard drive. I then created a NTFS partition on it and then formatted it using Windows 7, which my Laptops OS is, and then I was then able to install the SSD to my laptop, and then boot off of my USB stick to install the OS to the SSD using the Toshiba System Restore Utility that I made before yanking the original hard drive. The restore utility now was able to find the SSD and install properly. This installation process deletes the partition I made when prepping the drive as for Windows 7 wants its default structure of partitioning.
I then was all set with a healthy running Toshiba off of the 90GB SSD. Super Fast Boot, and Fast application loads, and longer battery life, but limited to like 72GB Free space after OS and all bundled programs installed to it.