Laptop freezes, then flashes solid colors

Not sure whether to post this on Hardware or Software. I have Windows 7 Dell Laptop. About a month ago, this system refused to connect to the Internet. I even connected the cable modem directly to the system and it still wouldn't connect. I took it to a local computer repair store. They couldn't get it working so they re-installed Windows. I brought the system back home and within 20 min, the laptop froze, and screen started to flash solid colors, black, white, purple, red, green. I recorded a video of it. I took it back to repair shop and they told me they monitored it all day and it never flashed colors. rought it home, happened again. Come to find out it only happens while browsing. I use Google chrome. I've also used I.E. and it still does it. I haven't taken it back to repair shop, but I'd like to get second opinions on what you think it might be. This has been scanned for Malware/Viruses with Malware Bytes, MSE, Spybot. Everything came back clean and since Windows was re-installed, their isn't much running on the system. It will allow me to reboot the system to get it back running normally, but after using the internet for a bit, the flashing happens again. As I am writing this, I'm rushing so it doesn't freeze on me. Is there anything else I can do/what do you recommend I look out for? We purchased another laptop and I would like to keep this one as a backup. Thank you!

 

Thank for the replies. I'll try both suggestions and let you know results.

 

Update on this system. It seems that Safe mode with networking allows me to use the laptop without it freezing and flashing solid colors. Also, I thought I had solved the issue because the power supply to the laptop wasn't charging. When I jiggled it, it did charge the laptop. It was charged about 1/2 way, I went online for an hour in Normal mode, it froze and flashed again.

Since it works fine in safe-mode with networking, what does that mean? I understand limited drivers are loaded, but what else should I be looking at?

I have a Dell Studio 1555
Windows 7 Home Premium, SP1
Intel Core 2 Duo,T6600 2.2GHz
4GB Ram
64Bit OS

No yellow marks in Device Manager. Flashing occurred prior to Re-install of Windows and after Re-install.

Also, no messages that monitor is going to sleep. I changed settings so the monitor is always on while I'm testing for a solution.

I do not have a live Linux CD, how can I obtain one?

Havent had time to do the Malware guide yet. This is my next step.

Thanks!