Working on an Optiplex GX270 for someone and getting beep codes when trying to power on. It will power on occasionally, but then it fails to read the drive and won't boot. Already replaced the motherboard due to fried capacitors but I still can't figure this issue out. Video of beep codes below:

http://www.youtube.com/watch?v=ZsTzj8Q-9o8&feature=youtu.be

As you can see, it fails to boot and throws the codes on the first attempt but boots ok on the second attempt (albeit with the boot failure message).

Sometimes the light on the front is green, sometimes it is amber. It is pretty inconsistent. Any help appreciated.