Hi guys, I need your help to figure out a problem which I think can be of a motherboard issue. From January 2010 I have been using Windows 7. From then I have experienced a copy paste problem, which is when I try to copy a large file (say over 500 Mb) the windows hangs. No programs respond and after sometimes it auto restarts and after the bios screen it gives message like boot manager cannot be load (not exactly this message but similar) and windows does not boot . I then power off the pc and after waiting for some moment again turn on the pc and this time it boots normally. The hang problem sometimes occurs without copy too and leads to the same boot problem after taking restart. But generally it occurs when I try to copy big files. I have tried small files like 5 mb-400 mb and it copied without any hang issue. At first I thought I have a problematic hard disk drive so to test I installed Ubuntu 9.10 and tried to copy files and it worked like a charm. To test I even copied 23 GBs of files at a time and it gave no problem. I installed windows XP and tried to copy and in XP too it did not hang but copy rate was sometimes very slow. So I ended up with the decision that my windows 7 version or disk might be a problem. In the middle Lan chip of my mother board was burnt and had to physically remove the lan chip and installed a external Lan card. Yesterday, I tried to install windows 7 again and it was not installing. First time it went to 26% of expanding files and was not responding after that for 30 mins. I then removed one of my RAM chip and tried again, and again it stuck at 19%. I therefore, went to my friend’s house with my hard disk and told him to install his version of windows 7 in my HDD to test. He installed it without any problem and we tried several test like copying big files and it worked well too. We copied a 1.5 gb file and some other 800 mb files and were successful with no hangs what so ever. I then came back home and installed the HDD in my pc and tried to copy a 800 mb file and damn it again hanged and gave the same old bios problem. I tried using one RAM chip switching both and problem still persists. What do you think the problem is? Please help. My PC Configuration Intel Pentium Dual Core E5200 Biostar G31 Motherboard Transcend 2 GB DDR 2 Ram (2*1 GB Sticks) Samsung 1 TB Hard Disk Drive (SATA) ATI Radeon HD 4670 PCI-E Card TP Link LAN Card (Network Adapter) BENQ 16x DVD RW (SATA) Normal 350 Watt PSU Samsung 933BW 19” LCD monitor (1440*900) Note that I did some hardcore gaming and it never hanged while playing games.