I tried un-sleeping my HP tx2510us last night after using it about 1 hr before with no problems and found it unresponsive / blank screen with both the caps lock and / num lock LEDS blinking ONCE ever 3-4 secs. No video anomalies, blinking screen, ect before hand, but it has been running a bit hot lately and after opening it up (see below) I should have cleaned this a long time ago. Anyway, according to HP's website the 1 blink denotes a CPU failure, BUT from all the threads I've read about numerous issues with the older tx1000's and tx2000's and the GPU becoming disconnected I'm wondering if this might be a video chip problem instead? So far I've stripped down my laptop, cleaned, and tried re-seating the CPU along with new thermal paste and heating up the GPU (didn't focus a lot of time on that yet). I still get the same error on power on (blank screen, caps lock and num lock LED's blink once then pause). For those of you that have fixed your laptop by heating up the GPU and resetting it, did you get the same 1 blink error or the 4 blink error? I went ahead and ordered a used CPU for around $40, but I'm betting that isn't going to solve my problem. Any other checks that I can do to determine just what might be faulty without replacing all the parts?