PC freeze after boot up

SalR

Honorable
Oct 14, 2012
1
0
10,510
Hello,
I have a 4 year old homebuilt PC:
AMD Athlon 64 X2 Dual Core 5200+
ECS GeForce7050M-M
Corsair XMS2 2x2 GB DDR2
nVIDIA GeForce 9500 GT
C-Media CMI8738/C3DX Audio Device
Hitachi HDP725025GLAT80 ATA Device (250 GB, 7200 RPM, Ultra-ATA/133)
PIONEER DVD RW DVR-108 ATA Device
The problem i'm having is everytime i start my computer after about 10s monitor says NO SIGNAL. All the fans are still working and the LED on my pc are flashing as it was still working. If i'm watching youtube or listening to music the sound stars looping when monitor shows no signal. Then i restart it and happens for 1 to 12 times in a row till it stars working properly. So like after 5 restart it can be that it will work fine for hours.
About 2 years ago i had problems with my CPU overheating and computer shutting down automaticaly but after changing thermal paste it was working fine. I checked CPU and Motherboard temp and it doesn't seem to be overheating.
Any ideas what could be causing these problems? Thanks in advance.
Sorry for any grammar mistakes english is not my native.