I agree with MSI. Until Man can create perfection 100% of the time, there will always be imperfect samples - even from makers with the best reputations.
But also it is important to note that OEM Windows licenses are NOT transferable to replacement motherboards unless the motherboard is the
EXACT same brand and model number board. The ONLY exception is if the original board is no longer available, but even then, you must use the recommended replacement from the same maker. Again, that's for OEM licenses of Windows - the most common. So, if the installation disk is “branded” with a computer maker’s brand name, or is labeled with “OEM", "OEM/System Builder”, “Upgrade”, “Academic Edition”, or "For Distribution with a new PC only", is
not transferable to a new PC (or upgraded motherboard) under
any circumstances. These OEM licenses are inextricably tied to the "original equipment". And most importantly,
as users, we agreed to the terms of the end-user licensing agreement (EULA) when we decided to continue to use the software on the original computer. And that makes it
legally binding.
Would i be able to use a 650W PSU?
I don't know. I don't the full specs of your computer to know the power requirements.
I will say this, there is no such thing as too big of a PSU. If your computer needs 300W, it will draw from the PSU 300W, regardless if the PSU is a 450W, 650W, or 1000W PSU. And the PSU will only draw from the wall 300W, plus another 45 - 90W due to PSU inefficiencies, wasted in the form of heat.
That said, a decent 650W PSU is typically more than enough for most users - if it's working.
Does this mean my PSU an Mobo need replaced.
That is hard to determine even if the computer is sitting on the technician's workbench. It could be the PSU or motherboard or even the CPU. Sadly, there are no simple tests to determine which - other than swapping in known good parts and that always comes with the risk of destroying those parts too!
But as a technician, I always want to ensure I am providing good power to my hardware before I even think of replacing other components.
Did you get POST beeps before when it was working okay? Not all motherboard have integrated system speakers, or are connected to a case speaker.