Power supply issues?

[imported_thefonz]

Here are my specs
aspire x-qpack with a 420 power supply
amd 3200+
gigabyte motherboard with the 6100 onboard graphics
x800gto
gig of ocz ram
lg dvd drive
a 80 gig sata hard drive

My problem is that my computer wont boot,
Well not exactly it will always boot for but for random amounts of time before it will crash.
I'll give you an example, I will turn it on, it will run for half a second and die, try again same thing, try again it will run untli just after the bios and will crash, reboot, loads windows , runs fine for 30 min, game it abit, crash.

Its very random, a couple times Ive just knocked the side of my case lightly and it will crash, There is no BSOD or error just shuts down.
I''m thinking it is the power supply

Any help or suggestions would be apreciated or similar experiences would help
aslo the pwr supply is a 20 pin connector with a adapter to 24 pin for my motherboard
dunno if that may be it

 

[montag451]

try a new psu -

 

[RealTime]

Yeah I agree with montag. Try a new power supply.

 

[ttimbo75]

there is a fair chance its just a loose connection too. Unplug all connections, and plug them back in. If this dont help, then yeah - new psu.