PC keeps crashing

Hello folks, can someone help me to fix this problem?
I keep getting these crashes now and again, all resulting on the same thing, no BSOD, but simply a black frozen screen or a screen with lines, and a constant sound tone (sound tone only with the line screen) It mostly happens when im playing games (not always the same game btw) but since the PC is only on when i play games then this may not be the problem.

the error code is as follows:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057

Additional information about the problem:
BCCode: 124
BCP1: 0000000000000000
BCP2: FFFFFA8007ED4038
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

there only seems to be one error code on the BCP2 which i cant find on google.

Also when i reboot and the the info i posted above, i also get told that there are 2 files saved to help me fix the problem, i can find one, but the other one is never in the folder it says it is and i cant find it. tbhe one i can access is a .DMP file which just looks like gobildygook when viewed.

my PC specs are as follows:

AMD phenom II x4 965
8GB 1666MHZ
ATI 5770HD
ASUS Mother board with onboard sound card.
 
What is the model and wattage rating of your power supply? The "gobildygook" is normal. You need a special program to "read" the dump file
 
Its an HEC (High Quality Evolution Commitment) HEC-550vp-2de


heres the info from the sticker on the side of the PSU:

AC OUTPUT - 230V 60MHZ 5A

DCI OUTPUT +3.3V +5V +15V1 +12V2 -12V +5Vsb

MAX A 24A 15A 28A 20A ]
.........................................0.3A 2.5A
COMBINED 120W 480W ]

TOTAL POWER 550W


Thanks for taking time to reply, much appreciated.
 
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