My computer was custom built. There's this little thing inside I can see (the tower's left side is clear plastic). It looks like digital clocks, only with two digits. It seems like it may have been a thermometer or something, since it only has 2 digits. Can anyone confirm this? I'm asking because today my computer has been freezing nearly after logging in (probably takes 120 seconds) and that little reader I was talking about says "FF" instead of numbers like normal.
Any ideas what this piece of hardware is, or what "FF" would mean?
EDIT: Actually, I just realized I think it's probably reading hexadecimal, since at one point it said "7F".