Computer restart and freeze problem !!

[thecrazyboy]

hii ... am new here ..  
need ur help !!
i was facing a problem as follows ... wn ever i start my pc it gets restarted again n again .. (restart as if by restart button on cabinet). after some tries wn pc doesnt restart for smtime then it continues to work as long as its nt turned off ... i.e re-start problem sirf starting mein aati hai - ek baar thori der tak chal jaye to chalta rehta hai !!

by this restart problem .. my windows got currupted n i then formatted my c: n installed XP again ...
now the problem has changed .. in place of restart computer freezes-- screen freezes , mouse freezes, keybrd freezes n e'thing .. wn this happens cabinet's red LED (that represents buzy state of pc continuously glows). also there's a small sound from cabinet (like rat's) wn pc freezes !!
this problem is also at start only ...
can somebody tell me wts this problem and how'll it b solved ... is it a problem of SMPS or wat ?

-----
i dont kno if its reqd or nt but here's my pc config : celeron 2.4 Ghz , 256 mb ram, 40 gb hdd,  running wind XP-SP1.

plz do share if u kno how can i solve this problem ..
thx !!

[Backdated]

Run memory and hard disk diagnostic test.
Use [highlight]MemTest[/highlight] and for the hard disk test, download the diagnostic tools from the manufacturers website.

[GX1_Man]

Try to work on your English as well. It's hard to follow all this text message gibberish.  

[thecrazyboy]

thanks for the help ... i'll c for these diagnostic tools.


to describe my problem in one line is ... 'wn i start my pc it keeps on restarting again n again n after some of these restart sequences it gets stable n can work for long hours w/o any problem'

other problem is same ... just replace the word 'restart' by 'freeze' !!!

and i dont think tht its hard to u'stand the problem ... yeah it was hard to describe it

[GX1_Man]

and i dont think tht its hard to u'stand the problem

Just hard to understand the question with the shorthand.