Recently I dived into the project to make myself ambient light for my computer.
I got the PCB figured out and that works.
But somehow my Arduino UNO isn't sending out 5 volts so the pcb wont work.
Your photos are rather blurred. Can you post a link to the led strip and draw a schematic please. Hand-drawn and photographed is fine.
Whe you say the arduino is not putting out 5V, what exactly did you measure, what did you measure it with and what reading did you get? If you were measuring a pwm output using a multimeter, then it may not read 5V, but that does not mean it is faulty.
Try the standard "fade" sketch. Try it for each pin 9, 10 & 11. If all three colours fade as expected, then the Arduino and your circuit are working fine.
I'll say first I'm new to Arduino so take this with a pinch of salt.
I've read or seen somewhere that the Arduino will probably not put out 5v when using the USB for power.
An external supply on the 9v would work better on that side.
Haven't tested this myself yet but I'm sure it was on a tutorial I watched.