Finished setting-up SIL's new HP 550-110. Everything looks great and Macrium Reflect Free worked PERFECTLY transferring user files from old PC. Even though this is an entry level rig with basic CPU, it is lightning fast compared to her old rig. Only concern I have is low power supply of 180w. She is a light user so hopefully all will be OK. Why would HP put such low power in a modern desktop? Thanks.That's fine, modern systems are incredibly power efficient.  180w is fine for the machine as it is, you would of course need to upgrade the PSU if you were to add any power hungry components such as a dedicated video card in the future.With pre-built systems like that HP, the manufacturer puts in a "just the right size" PSU with little to no allowance for expansion.I'll just agree with camerongray here, I'd EXPECT that PC to pull maybe 120W under full LOAD, so the 180W PSU is plenty.  As strollin says, HP aren't going to waste money on, say, a 500W PSU when it's just not needed.  Most people tend to go overkill on the power supply and it's not usually necessary unless planning for a power-hungry upgrade in the near future, so it's understandable to be a little concerned when you see such a low-wattage PSU but it won't be an issue.

Don't mention my 1200W PSU powering a PC that draws around 350W at full load...it was spare so I used it!