Moved motherboard to new case, and now it won't power on. Did I fry the board?

[Salakavala]

I aquired a Dell Optiplex 9010 on the super cheap, as well as a GTX 460. The computer already had an i5-3570 in it, so I bought a new case, 500w EVGA power supply (the GTX requiring a 450w), and four sticks of DDR3 1600 RAM.

I installed everything in the new case, before realizing that the Dell board had a proprietary front-panel pin setup. Research told me that I could still jury rig it without risk of harm, I just had to figure out which pins were which via trial and error. I plugged the power switch into two pins, plugged in the computer, and turned on the PSU. I was immediately startled because the whole unit powered on without me having pressed the case's power switch. It stayed on, so I plugged it into the monitor. An error screen presented itself listing a number of issues.

-Rear Fan error (I ignored this, because the old case had a specialized system fan plug, but the new case had two giant molex ones, rendering it obsolete)
-Front Panel I/O Error (Duh, I hadn't plugged those in yet)
-Power Switch Error (That's what I was testing anyway)
-Invalid Graphics Configuration Detected: Action Required

The gist of it was that the system detected an add-on card, but the monitor was plugged into the integrated graphics. The reason for this is that when I tried to use the GPU's HDMI-out, nothing was showing up on the screen, at all. It only showed up when I plugged it into the mobo's VGA out. So that was perplexing. In hind sight, I probably should have taken the GPU out and tried to boot it again, but I was more interested in correcting the power switch issue at the moment, since I didn't want to keep using the PSU switch to power the system on and off like that.

Since the power switch wasn't working, I did use the PSU switch to cut the power. Waited for it to discharge, then tried another pin configuration for the power switch. Each time, flipping the PSU power switch powered up the unit. On the fourth try, the power switch DID turn off the computer. However, it did not turn it on again. Resetting the PSU switch did not do anything either. Pulling the power switch off the pins did not change this.

So, did I ignorantly do something stupid, and accidentally fry the motherboard? Or is this an issue with the power supply? Or maybe even something else I haven't considered?

 

[william p]

Why did you need to swap the case? Dell builds so many of each system that they do proprietary things all the time. I don't know about the 9010 but I can share some general Dell issues I've encountered.
1- Fan error message. These messages get set in the BIOS SYSLOG or event log and won't clear themselves when you fix the problem. You must clear them manually.
2- Front panel I/O error. Dell uses an Ambient Temperature Sensor there. You will need to get the resistance of it and spoof those 2 pins on the MB. This is in addition to all the normal stuff.
3- The GPU problem could be 2 things. Old drivers not removed.
Step1- use SYSTEM RESTORE to make a restore point to save the existing drivers.
2- Bott into Safe Mode and remove the old drivers.
3- Install new GPU, boto into Safe Mode with internet and load new drivers.
The other issue is EUFI compatability between GPU nad BIOS. The Dell should be EUFI. If the GPU BIOS is EUFI then you're OK. If it's "Legacy" then you need to turn off Secure Boot, and CSM mode in the BIOS.
As far as the power switch goes you're on your own. It's definitely possible that turning the PSU off and on may have ruined the MB.