So, I got a Kossel Mini 3D delta, with a Mega 2650 board. I have some issues.

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Me
Got a FLsun printer, the Kossel mini delta style. The instructions weren't too bad to figure out although they were obviously run through an inferior translator. [i.imgur.com]
However, the firmware isn't right. When trying to push the firmware to it (it is setup with Marlin firmware as stock) my arduino software kept saying that it wouldn't verify. I downloaded the most current files from Marlin and could upload it but I am a bit wary to do that considering there might be differences I am not familiar with.
I'm familiar with MatLab however I haven't ever messed with anything in the arduino world. Despite that I have found a couple of glaring issues that look like something I can fix (uses fpos instead of filepos, stuff like that,) but most of it is over my head for now.
Any insights anyone might have on it? I would like to figure out some way to compare the two files side by side and verify they match like that, but I don't know of any way to do that other than physically checking each and every line.

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I decided that since I have the firmware that came with it, I might as well try the Marlin stuff. No go. For some reason Com3 isn't talking.
Arduino: 1.6.12 (Windows 10), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"
Sketch uses 50,020 bytes (19%) of program storage space. Maximum is 253,952 bytes. Global variables use 2,709 bytes (33%) of dynamic memory, leaving 5,483 bytes for local variables. Maximum is 8,192 bytes. avrdude: ser_open(): can't open device "\.\COM3": Access is denied.
avrdude: ser_drain(): read error: The handle is invalid.
avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout the selected serial port does not exist or your board is not connected avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout avrdude: ser_send(): write error: sorry no info avail avrdude: stk500_send(): failed to send command to serial port avrdude: ser_recv(): read error: The handle is invalid.
avrdude: stk500v2_ReceiveMessage(): timeout avrdude: stk500v2_getsync(): timeout communicating with programmer
This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.

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Changed it from Com3 to Com2, seems to be uploading now

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I was able to upload the firmware. I cannot seem to upload any sort of gcode or whatnot to actually get it to do anything. Repetier is reporting a bed temp and that temp seems to correspond to the actual temp of it (maybe I'll put a heat gun on the bed and see if it responds.)
Right now I'm still at the stage where I'm trying to home everything and ensure that the various sections of the machine are talking to each other and are doing what they should. I've tried G28 and get nothing but "1 Command Waiting"
As I mentioned, I keep reading that a mis-matched baud rate is the culprit for that, but I have tried adjusting all that and gotten no results

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Me
Ok, got it talking, got the original Marlin software files figured out (was searching for fpos in another file while I had changed it to filepos)
So, it's connected. It is logging temp of the build plate, and other info so I know it's talking. However I've now got "3 commands waiting"
Googling seems that changing the baud rate is the most common problem, however that hasn't done anything for me.

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So, I've had many issues with getting this thing setup, currently it appears that it isn't communicating with the Repetier software. It keeps giving me "X Commands Waiting."
I've tried adjusting the baud rate as that seems to be the main thought behind why it doesn't communicate, but that doesn't seem to do anything.
I posted another thread chronicling what I went through to get it to this point, but I haven't received any help from it, so I figured I'd ask this section.

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DjDemonD
Okay so your power supply is okay, but these chinese LCD supplies tend to exaggerate their power rating, so a 250w supply probably isn't going to kick out more than 200w. Which might be pushing it for 4 motors, a hot end heater and a heated bed.

However the issue here might be related to how you've wired the PSU. You've got both + and - connected to + terminals. Move the black wire over 1 terminal post to the left.