I have a Acer Aspire 5517 Laptop, and need to know how to tell if I need to update my BIOS.

My Acer Aspire 5517 Laptop is running Windows 7 X 64 with an AMD Athlon TF-20 Processor at 1.6Ghz with 2GB of physical memory. Every once in a while, and lately quit frequently, my screen goes black, and it will not boot...I have attached an exterior Monitor to it, with no success, so I assume it is not the video portion. To get it to boot I turn it off and on until it re-boots. Sometimes it reboots quickly and at other times it takes several minutes...up to 20 or 30 sometimes. I have run a disc check to see if all the sectors are good on the hard drive. It checks out okay..I thought if the BIOS was out of date, I would update it, to see if that helped...Any suggestions, much appreciated..