### **Issue Summary**
I am experiencing issues with my **Razer Core X (PS-7701-2)** after switching GPUs. The enclosure no longer works with any GPU, and I need assistance identifying whether the problem is related to the **power supply unit (PSU)**, the **Thunderbolt 3 connection**, or the **Razer Core itself**.
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### **Details and Steps Taken**
1. **System Specifications:**
- **Razer Core Model**: Razer Core X with PSU PS-7701-2 (650W)
- **GPUs Tested**:
- NVIDIA GeForce GTX 1080 Ti (8-pin + 6-pin power requirement)
- NVIDIA GeForce GTX 3050 (6-pin power requirement)
2. **Initial Behavior:**
- The system worked perfectly with the GTX 1080 Ti installed.
- I tested the GTX 3050, which also worked fine in the enclosure.
3. **Issue Onset:**
- After reinstalling the GTX 1080 Ti, the system stopped functioning.
- Since then, neither the GTX 1080 Ti nor the GTX 3050 works in the Razer Core.
4. **Current Symptoms:**
- No power activity when the Razer Core is connected to power with or without a GPU installed.
- GPUs do not light up or spin fans when installed in the Razer Core.
- The Razer Core does not show signs of activity (no fan spin, no LEDs).
5. **Tests Performed:**
- Verified correct PCIe power connections:
- GTX 1080 Ti: 8-pin and 6-pin connected.
- GTX 3050: 6-pin connected.
- Swapped between the GTX 1080 Ti and GTX 3050 to test functionality.
- Tested GPUs in another system to confirm they work.
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### **Request for Assistance**
I am seeking guidance to:
1. Determine whether the PSU or another internal component of the Razer Core X is faulty.
2. Understand the expected behavior of the Razer Core X when powered on without a connected PC or GPU.
3. Resolve the issue through troubleshooting or repair.
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### **Additional Notes**
- The system previously worked fine with both GPUs.
- The issue arose only after switching back to the GTX 1080 Ti.