pc wont post

[Allotec]

I have a old prebuilt pc that i acquired and i changed the power supply on it to a newer one bc i didnt want it to blow up. Now when i try to boot it up the fans spin up and i hear the hardrive engage but it doesnt post it just sits there lighten up. I also threw out the old psu. I am wondering if i can fix this or is this one of those systems where you cant change any of the components bc of oem stuff or assembler stuff. 

[Whiro]

10 minutes ago, Allotec said:

I have a old prebuilt pc that i acquired and i changed the power supply on it to a newer one bc i didnt want it to blow up. Now when i try to boot it up the fans spin up and i hear the hardrive engage but it doesnt post it just sits there lighten up. I also threw out the old psu. I am wondering if i can fix this or is this one of those systems where you cant change any of the components bc of oem stuff or assembler stuff. 

Are you trying to boot using dedicated gpu or igpu? 
You can try some basic troubleshooting first if you didn’t do it yet. Clearing cmos etc

[DarkEnergy]

What are the specs and what is the current rated wattage of the PSU? You probably just plugged something in wrong.

[Allotec]

9 hours ago, Whiro said:

Are you trying to boot using dedicated gpu or igpu? 
You can try some basic troubleshooting first if you didn’t do it yet. Clearing cmos etc

The pc has no dedicated gpu and I removed the cmos battery and put it back in already

[Allotec]

9 hours ago, DarkEnergy said:

What are the specs and what is the current rated wattage of the PSU? You probably just plugged something in wrong.

Cpu- old core i3

500gb hard drive 

Asrock h77m

One thing to note is I went from 200 watt to 500 watt psu