PC crashes after replacing hardware

[rhp485]

Before replacing any components my PC kept crashing without warning showing either a black screen or a light blue screen with horizontal lines. The advice I received suggested that it was my wireless adaptor that had no drivers yet for Windows 7.
Today I replaced that with a TP Link PCI wireless adaptor that temp runs on vista drivers as stated on it's website. I have also upgraded my graphics card from ATI HD3450 to HD4650. My PC has just crashed again. My cursor changed from an arrow to a vertical line then the screen frooze.
Has anyone any idea what the trouble might be?
Thanks. Robert.

 

[torrentg]

Hey.

Your psu is probably too weak. Do you know which you have?

You can follow this: http://www.sevenforums.com/crash-lockup-debug-how/34900-1-novice-how-ask-help-bsod-problem.html

 

[rhp485]

I got my PC last December and on the original spec the PSU is shown as 550W. Regarding the BSOD help I cannot find anything in the widows/minidump folder can you advise me how to turn it on if that's what you have to do?
Thanks.

 

[torrentg]

It's on by default, so we may as well just wait until it happens again and take it from there. If you're using a Windows "found" from other than Microsoft being the official source, therein lies the problem.