Won't boot on first attempt.. advice? (power but no boot)

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Hi all, i have come across this site while trying to google some answers, i hope someone might have an idea (or similar expriences). Basically the issue i am experiencing is that my computer will not boot (or POST i believe) when i press the on button (power though) in most cases. To solve this all i need to do is hit reset and it boots.

This is a little different to the 'wont boot at all' issues, which i did experience myself the other week after installing another hdd. (i found asus very useful regarding this at http://support.asus.com/troubleshooting/troubleshooting.aspx?no=762&SLanguage=en-us and particularly http://support.asus.com/troubleshooting/troubleshooting.aspx?no=758&SLanguage=en-us - all i needed to do was "reset the power supply", pretty painless...)

Now i always figured this was a problem for me because my computer is old, and especially as this has become more and more frequent. However, a friend of mine with a new system has the same issues so i just want to know what is up with this?

To the details:
Mine is Athlon XP, ASUS A7V8X-X mobo, i just put in a new PSU and no difference.
Her's is Athlon 64, ASUS A8N-VN CSM, Antec SLK2650 PSU/Case
Im not sure what else matters..

So the point of all this, is that this situation seems a bit odd, given that nothing seems wrong on the whole (it works fine otherwise) but now everytime i want to start, i have to press on and then reset... any ideas about this?

Does this make sense? Thanks for anything..

S
 
What is the wattage of your psu, it should be printed on the label on the side of it.
 
The current PSU is a 450watt, and the old one was 350. There hasnt been any difference between the two which makes me think it is the motherboard, i am just not sure how common this problem is.
 
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