computer won't start after replacing psu

[silkmudah]

I recently upgraded my PSU in my system and gave my friend my old psu. after installing my old PSU into my friends system it won't boot, it will start and get to the loading Windows screen but it won't show the Windows 7 logo and just freezes on that point. sometimes it will distort the resolution and make it look like bad 3d that you need those red/blue lens glasses for.
I don't know if its because I had to take the fan off the heatsink to get it in but never removed the actual heatsink or cpu. it won't even try to reinstall a fresh copy of Windows it just freezes during that as well. If you need more info let me know and ill reply with what I can

 

[Snakeyeskm]

Listing the basic specs of your friends PC (video card in particular) and of your PSU will help in identifying the problem.

 

[silkmudah]

AGI-U550UB power supply and its a prebuilt pc its a ACER AM5641-B5540A which is this Acer Aspire AM5641-B5540A Pentium Dual-Core E2200 2.2GHz 3GB Acer AM5641-B5540A

 

[silkmudah]

update, put in original psu and still same problem. any chance that because of me having to remove the fan on the heatsink it somehow made it move and become unusable until resinked?

 

[linnemeyerhere]

It's worth a try to remove CPU and it's thermal paste, inspect the pins very carefully and re-install with new paste. Then boot with only one stick of ram in number 1 slot. Double check all PSU power connections and tell us what happens. If needed you may want to clear the cmos and try again. Once a successful boot then install rest of ram while turned off and reboot.

 

[Layback Bear]

Are you installing the heat sink back on the cpu before you start up after installing the different power supply?

 

[silkmudah]

i technically never removed the actual heatsink just the fan that attaches to it. its a older case with the psu on top and the fan was in the way. i will remove it all and reapply thermal paste when i can and then update

 

[Layback Bear]

The point I'm trying to get to is: Never run your computer without the cpu cooler installed and the fan installed and working properly.

 

[alphanumeric]

I would reseat your Video Card, and any other add-in cards in the PC. RAM modules too. Also check to make sure your SATA cables etc are plugged in securely. Stuff can get bumped and moved around when doing something like a power supply swap and not be obvious that they aren't firmly plugged in.

 

[silkmudah]

I haven't tried running it again and wont until i can reseat the heatsink and such, i will remove the ram and replugged in all cables

 

[pscowboy]

Some motherboards won't complete POST & boot if they don't detect a cpu fan plugged into its location.

 

[silkmudah]

alright, so found out its just a bad ram stick, took one of them out and it booted to a weird only black lines with nothing loading after that. shut down and took that stick out and place the other in and it booted fine!

 

[Layback Bear]

I would suggest after all that moving things around and heat sink work that you monitor your temps. Just to make sure things are running cool.

 

[alphanumeric]

alright, so found out its just a bad ram stick, took one of them out and it booted to a weird only black lines with nothing loading after that. shut down and took that stick out and place the other in and it booted fine!

What happens if you put the other stick back in? It may not have been bad, it may have just not been seated correctly.

 

[linnemeyerhere]

That's good news that you've identified the source of the problem. Odd that the stick would be fine and then go bad. You may want to blow out all the slots and re-install the good one then the suspect ram and see if you can get both seen. If not then I would consider a matched ram stick either 2 or 4 sticks purchase as ram is relatively cheap. I love my newer sticks. Crucial Ballistix Tactical Tracers:Crucial Ballistix Tactical Tracer 4GB 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory (with Orange/Blue Light) Model BLT4G3D1869DT2TXOB - Newegg.com