• Hello. the patient is pc precision t1500. I replaced the burnt power supply that burned down due to a short circuit in the front usb. I disconnected the faulty usb hub and when I turn on the computer, there is a black screen after POST, only ctrl alt delete causes a restart. the same happens with disconnected disks or booting from a pendrive. I reset the cmos and replaced the batteries in the bios, I tried all the bios settings but to no avail (many are not there). when I change the frame to another slot, it does not start at all, the system normally shows the booted diagnostic option did not show any errors. is it a damaged motherboard? I will add that the capacitors are not swollen. I have a video how it works

 

 

https://drive.google.com/file/d/10DDMj3J4h4zle-lVzVYYWns4vs_FtYwY/view?usp=drivesdk