Three beeps on startup, but no other problems

About a month ago, I upgraded to a new Nvidia card (GTX 760) and there were some problems with the install.  The power supply wasn't up to snuff so I had to go out and get a better one with 600Ws.

Before that new power supply, there was a string of blue screens of death:

0X00000050

0X000000A

0X000000F4

When installing the new power supply, I noticed that a cord from the heat sink to the mother board was loose.  I am unsure if that had been that way previously or just came loose when installing the new power supply.

Now, when I start my computer there are series of beeps. 1st beep then a pause of 15 seconds, then a 2nd beep with a pause of around 18 seconds then a 3rd then the startup proceeds as normal.

And, other than that, my computer is running fine.  There have not been any BSoD since the new power supply was installed and no other problems have been noticed.

My questions are what does the series of beeps at the start mean?  I think it is something to do with the motherboard, but I have no idea how to determine what the problem might be.

The second is, given the lack of any problems for over 3 weeks, is there anything for me to be worried about?  No BDoD, no other noticeable PC problems, and the only thing off is the 3 spaced out beeps at start up.  What to do?  Thanks for any advice on this.

XPS 8500

Windows 7

Intel Core TM i7-3770

64 bit