When getting the F1/F2 when the system is booting it, it is used to note an unusual issue with the system that it wants to bring to your attention.  Generally, when getting this there is a message prior to receiving this to indicate the potential cause.  If there is no unusual messages, then the issue could be due to a USB storage device that might be attached causing this to occur.  If the issue continues, then I would look at removing any PCI cards temporarily, and have only the keyboard, mouse, monitor and power cord.  From there, might be a call to support to see if there is something within the hardware preventing this error from being resolved.  
We have recently experienced a problem when booting up our T610, which happened out of the blue.  During the bootup process, the system stops with the statement "Strick the F1 key to continue, F2 to run the system setup program".  If we are there, it is not a problem to click the F1 key to go on and boot up.  The real problem is that now we cannot do anything remotely that would cause the server to restart, as someone would have to be in the office to answer this statement.  Any ideas as to why all of a sudden the bootup is stopping with this statement and not automatically continuing with the bootup?
PowerEdge T610 Bootup Problem