My pc is currently locking up at varying intervals after being turned on. IT has run without any problems in the 6 years I have had it. I have noticed, and this may be paranoia, that it seems to happen more during hotter times of the day. Unknowing as to what the problem might be I installed Intel's alerting panel. I had this installed when I first got the pc but neglected to install it after my most recent format. Previously it would read voltages as to what would be expected, ie. 12v for 12v 5v for 5v etc. However this time after opening it up I noticed the 12v was reading 11.3v. I moved on thinking not much of it as it is in "safe bounds" from what I've read. After an hour or two of gaming I received an alert that the 12v was going as low as 10v. I took the PSU to circuit city where I was told all the voltages were normal. I proceeded to install speedfan which read below normal or normal temperatures for everything but the core which read 56c. After taking the heat sink off the cpu I noticed the compound I placed between the two had turned to a dirty substance which I would have to assume would not work for its purpose. I have some of the specs but not all of them and will fill in any others later if need be. OS: Windows XP Prof CPU: Intel Pentium 4 2800 Video Card: Geforce 6800 GT OC PSU: Antec 350w came with case Model SL350 Mother Board: Intel based will get exact model later Any help is greatly appreciated. If any additional information will help diagnose the problem please let me know.