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Should i upgrade my power supply?

\015 My computer running on 230v and i upgrade ram 512mb to 2gb and add an hard disk drive 0f 160gb and add an graphics card of nvidia 9500gt. after this my computer shows an blue screen error for a second and restart automatically. should i upgrade my power supply ?and how much upgrade power supply ?please help me\015

Answers :

First refix both RAM. check its frequency may be it is conflict with each other meory frequency.
Also when you power up the computer press F8 key then enter in safe mode.
Then go to start menu type in run "chkdsk /r" then you see black screen press "y"
then resatrt it then it fix error on harddisk.
This problem is not related with power supply.It is related to RAM memory or harddisk memory.

How powerfull is your powersupply? it should say on the side of the powersupply the wattage, for example 300W

if you can't find that please tell me the brand and model from the powersupply that read on it.
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