Why does my computer randomly restart when i'm playing a game? HELP?

[DKDCfernando]

when i'm playing games, in the middle of a game the screen would cut out, i could hear the computer power down but i could still hear the audio from the game. After a little while the audio stutters and my computer beeps and restarts. Im getting real frustrated because this keeps happening and obviously i need help. Ive checked my temp and my cpu is running hot according to some temperature software i have.


Additional Details

AMD Radeon HD 4870 darknight
4GB RAM
Intel I7
850W power supply ( http://online.barclays.lk/bc/itemdesc.asp?ic=14229&eq=&Tp= )

this is my casing
http://online.barclays.lk/bc/itemdesc.asp?ic=17240&eq=&Tp=

and these are run test of heatups
http://i39.tinypic.com/e8tspe.png

http://i39.tinypic.com/344dweq.png


please help me, other applications are running perfectly, but i can't play games

 

[DKDCfernando]

kauruth danne nathda solution ekak

 

[miyuru4u]

1.) VGA eka galawala onboard VGA eken test karala balanna... onboard natnam wena vga ekak gahala balanna..

2.) vga drivers uninstall karala aye install karala balanna

3.) full format ekak dala latest drivers install karala balanna

 

[වැඩ්ඩා]

Check your Ram......

 

[dgvirajm]

maybe because your ram or vga is loosed ... remove them clean them and also the slots (remove dust) ... and install them tightly and check

 

[rcccc]

vga eke hari ram eke hari awulak
vga eka onboard nam chip eka rathwenawada balapan seperate nam card eka glawala onboard vga try karala balapan.
ram ekath marukarala balapan
me ekak wath hariyanne naththam pc eka format karapan

 

[melanxpress]

VGA awlak bun.
Windows classic theme eka dala balanna

 

[gudaya]

machan avarage temp eka keeyak witharada and game eka play karana kota temp ekath danna balanna,godak welawata temperature awlak wenna puluwan,temp eka wadinam karanna thiyenne,heatsink eka remove karala old tim eka remove karala aluth tim ekak apply karala heatsink eka aye danna

 

[DKDCfernando]

man try kara macho okkoma... mage onboard na Extreme board eka... format kara, aluth drivers daala baluwa, parana driver eken try kara, power supply eka 550w eka ain karala 850w eka damma, casing ekak maru kara (link eka daala tiyenne eka) eth tama mata lede hoya ganna bari una...

tawa case ekak tiyenawa, me case eka nisa man aran giya unity ekata gathta tanata, ehedi hodata wada karanawa eth gedaradi wada karanne na...

 

[DKDCfernando]

man try kara VGA eke BIOS update karanna eka please wait kiyala tiyenawa witarai mukuth wenne na...

http://www.asus.com/Graphics_Cards/AMD_Series/EAH4870_DKHTDI1GD5/#download

meke tiyena widihata kiyanne crossfire problem eka nati wenawa kiyala bios update karama.. eth update eken mukuth wenne nane

 

[gtkisaru]

vga drivers

 

[gudaya]

oya fault eka thibunu pc ekak eye goda damma,reason is TIM

 

[Razor338]

ram gone kollo