Random restart then says reboot and select proper boot device

[HowWeGetAnts]

I've been trying to fix this problem for a while now and am at my wits end. My PC will randomly restart and then show the black "Reboot and select proper boot device" screen. I've done a complete HDD wipe and reinstalled Windows 7 Home Premium, which fixed the problem for a few days, but then it started randomly restarting and showing the same screen again. I only have one hard drive in my computer and have check the BIOS to make sure it's booting from the HDD and has it as top priority. I can't think of anymore options, have looked online and can't seem to find anyone who has the same problem, just that it shows it on boot, but not the random restart. Please help, thank you!

 

[logainofhades]

Full system specs could be helpful, but it sounds like your motherboard is having issues.

 

[jty0yt]

Have you reset the CMOS chip/battery ? It's on your mobo.

 

[HowWeGetAnts]

Thank you for your quick replies. Here's my computer specs, let me know if you need more information.
I haven't tried resetting the CMOS chip yet, but will get back to you after I've tried it.

Computer: eMachines ET1331G-05w
OS: Windows 7 Home Premium
System type: 64- bit
Processor: AMD Athlon II X2 250u Processor 1.60 GHz
RAM: 4.0 GB
Graphics: GeForce 6150SE nForce 430
BIOS Version: AMI P01-A2