DC motor is pulsing when connected to power supply

Apologies in advance if my terminology is not exact, as I'm a very amateur hobbyist just starting out.

I have a DC servo motor that I bought used, rated at 24V maximum, with variable RPM depending on how many volts I supply to it. The motor works fine when I connect it to a 9V battery, but pulses and drains a connected power supply periodically (every second or so).

I bought a power supply so I could use the motor from an AC outlet (USA - 120V).

This is the power supply: https://www.amazon.com/gp/product/B01B1PRE42

Specifications:
Input Voltage: 110V/220V;
Output Voltage: 24V DC 2A Output
Current: 0~2A
Power: 48W
Shell Material: Metal case
Protection: Shortage Protection. Overload Protection. Over Voltage Protection
Safety Compliance: CCC/ FCC / CE
Working Temperature: 0~45 degree
Storage Temperature: -20~65 degree
Ambient Humidity: 0~96% Non-Condensation
Package Content : 1 x 24V 2A Switching Power Supply


The power supply has a small green LED above the variable output screw. I tested the output with a multimeter when I connected it with 18/2 lamp wire to my outlet, and I verified (at least I think I did) that it is outputting between 9V minimum and 24V maximum, depending on the screw being fully counterclockwise or clockwise, respectively.

When the motor is connected, it spins for a brief moment (100 milliseconds or so) and the green led on the power supply goes out. Then the green led turns on again (it takes about a second) and the motor again spins and the led goes out, and this cycle continues endlessly.

I have checked that all my positive and negative connections between the power supply and the motor are correct, and the neutral AC to power supply matches as well.

What am I doing wrong?

EDIT: photos of the motor...

• You haven't given any details of the servomotor, but it may be that the current it needs to start moving is more than the supply can handle. This style of supply usually has a fairly limited overcurrent capacity and will either fold back (reduce the supply voltage) or shut off completely once that overcurrent limit is exceeded. – Phil G Jan 29 at 22:20
• Thanks @PhilG, I wish I had more details on the motor, it was surplus from my local hobby store and is 15 years old (I got it real cheap!). I searched the internet high and low and could not find any specs. The only info I have is the variable RPM speed that the seller had. – binarymax Jan 29 at 22:22
• A photo would be better than nothing. Someone might recognize it. – rdtsc Jan 29 at 23:11
• Can you hook up a multimeter in series and measure the current? Even basic ones usually have a max-hold-feature. – winny Jan 29 at 23:22
• @PhilG has the right idea. Your supply is probably not able to handle the inrush current and is shutting itself off. – Hearth Jan 30 at 0:12