computer boots to black screen with blinking underscore!

sarada2011

Reputable
Aug 9, 2014
10
0
4,520
hi, its now about two weeks i'm facing this blackscreen with blinking underscore problem. as on the start of this problem my pc begin to BSOD and it showed me a message like this:

*** Hardware Malfunction
Call your hardware vendor for support
*** The system has halted ***
NMI: Parity Check / Memory Parity Error

so i turned off my pc manually and fired up it again. the pc started and goes to desktop screen, but after 10 minutes it freezed and again BSODed , only this time the message was:

*** Hardware Malfunction
Call your hardware vendor for support
*** The system has halted ***
NMI: Channel Check / IOCHK

at first i thought it was a memory issue. so i changed my RAMs and it ran perfectly for 1 day. after that my pc only goes to blackscreen with blinking underscore. now i've noticed i can only switch to bios screen .
Things i have tried
1. i've two HDDs. on the 1st i've win7 (64 bit) and on second linux mint 16 (64 bit). so, i've opened my mid tower case and unplugged the HDDs and tried to boot from optical drive with win7 dvd.
2. borrowed two RAMs from a friend and replaced with my current one.
3.tried to diagnose the memory modules with "memtest86+ 5.01 usb".also unplugged every other drives including optical and tried to "secure boot" only with the usb drive.
4. monitored temp and voltage of the cpu and psu:
cpu temp : ~55c. cpu voltage : ~1.296 v. 3.3 voltage: ~+3.320v. 5 voltage: ~+5.200v. 12 voltage: ~+12.192v.(according to bios reading)
after all of these tests no luck only blinking underscore.i've never overclocked my pc since i bought it last year august 2013.

My Questions

1. i've amd a10 6800k apu and i've read in this forum that the stock voltage of this apu is 1.33v but i'm getting around ~1.296v. so, is it very low on voltage due to which my pc is failing on boot?
2. my integrated gpu is "radeon hd 8000", i've no dedicated pci express cards. so is that my gpu is gone?
3. in case the psu is faulty did it cause any damage to my power converter on my motherboard?

My Specs

mobo: asus f2a85-v pro
apu: amd a10 6800k
ram: (1x4 gb) hynix ddr3/1333 mhz
psu: iball sprinter 500 (500w)
hdd: 1). toshiba 500 gb (os - win7 - 64bit)
2) segate 160 gb (os - linux mint 16 - 64 bit)

pls hlp friends.