Hi, everybody. I have a pretty old computer that my grandpa brought in some time ago. When I first tried it out, it didn't POST, but powered on. I tried things such as booting w/o no BIOS battery, booting with a proven good BIOS battery, and other things. It didn't POST, despite all of my attempts. Later, I tried again, to no avail. Again, (◕︵◕). I removed the PSU and cleaned it. I installed it back into the system and plugged it in. This time the system didn't even TRY to power on. Today, I wanted to boot the OS on the HDD, and faced the BSOD (different storage controllers) with code 0x7b. I attempted to boot it on my grandma's computer, so that's what's causing the BSOD. I try again in Safe Mode, to get the BSOD again. I reconnected the primary HDD and booted into the computer's factory OS (my grandma's) and the disk is still good. Now back to the computer. I want to get this system back up and running. There are no bad capacitors. What went wrong? Why does the computer suddenly stop turning on after I clean the PSU? How do I bring this computer back to life? Please help me and thanks in advance!