Fan is spinning, only 2 LED lights is on, is the GPU damaged?

Hello,

I installed a new OWC 1T SSD chip and another 1T SSD to replace the HDD on my iMac.

I also touched on the CPU & GPU area to clean and reapply the thermal paste (now I wish I didn’t)

At first, it had 1 LED on, and the device didn’t power on. After some research, I changed the PRAM battery and rechecked the CPU area, and I found a small bent on the edge of the CPU. I fixed the bent as much I could and reapplied the thermal paste.

After that, I turned it on, and now 2 LED is on, and the fan is spinning! But still, there is no sound indicating the device is working normally.

I tried the PRAM reset, and it is the same: no sound, 2 LEDs is on, Fan is spinning.

Can you point me to the possible problem in this circumstance? Thanks in advance for any help